Special vineyard trellis wire - 'Quadruple life' - aluminium/zinc galvanised steel: 
  galvanised with an alloy of aluminium + zinc. Tests on the corrosion behaviour have demonstrated that this wire has four times the life of normal zinc-galvanised wire (DIN 1548 thick-zinc-coated).
        2.0mm is used for all wires of a Guyot trellis. It is very easy to handle and bend.
        2.0mm diameter: £49.50 per 1000 metre / 25 kilo roll; lower price for larger quantities
            (e.g. 40 rolls @ 37.50 Euros per roll plus delivery on a pallet from Germany @ 250 Euros).
        2.2mm diameter (825 metres / 25 kilo roll) and 2.5mm diameter (650 metres / 25 kilo roll) also
            available (not stocked), for GDC trellis.

  A wire-spinner @ £125 is invaluable, you really should put up at least the main wire during the first growing season, to stop the canes blowing around in strong wind. Red oxide coated steel.

Or stainless steel wire, 1.2mm diameter, 1500 metre long reel (13.35 kilos), can be run out easily, £78
About 25 years ago I used this in my vineyard, it's amazingly strong and still in excellent condition.

Wire straining devices:-

  Spannfix: galvanised, 36p each.  Key for turning Spannfix, red oxide, £7
              some secondhand Spannfix in good condition @ 24p each

    Alloy-GS: for very short rows, use with a 13mm spanner, new @ £1.50 each
                                                               some secondhand @ 50p each

  Chains: for moveable (double) wires, 7-links, galvanised steel, 26p each
                                                                                       some secondhand @ 16p each

Chain nails: large square nails, for wood end posts with moveable (double) wires,
          aluminium-zinc galvanised, 55 mm long x 4.2 mm square: £4.80 per kilo (approx 130 per kilo)
                                                                                           2.5 kilo bucket @ £10.00

Hook-nails: for intermediate wood posts with moveable (double) wires,
          aluminium-zinc galvanised, 55 mm long x 3.4 mm square: £5.40 per kilo (approx 160 per kilo)
                                                                                           5 kilo bucket @ £22.50

Vine support poles: galvanised steel, 6mm diameter, 1.2 metres tall @ 35 Euros per 100; 1.4 metres tall @ 39 Euros per 100; 1.5 metres tall @ 43 Euros per 100; plus delivery from Germany at cost.
These prices are for 2000+ (I don't usually sell small numbers of these). 
They should last indefinitely, whereas bamboos break off at soil level after a couple of years. It's very worthwhile supporting the vine stocks even when they are 20 years old.
and
Long-lasting plastic clips, for securing a 6mm diameter steel vine-pole to a trellis wire, @ £18 per 500

Vineyard posts:-
It's not easy to find kiln-dried and tanalised softwood posts at short notice, except perhaps from Jacksons Fencing.
I have a new arrangement with a Hungarian producer of acacia posts, acacia is a very hard wood and the posts are claimed to have a life of 25 to 40 years. The only problem is that the wood is so hard that before hammering in the nails/hook-nails it is necessary to drill small holes with a portable hand drill; not as laborious as it may seem. Prices on request, large quantities only.

Some larger vineyards are now using galvanised steel posts. Apart from their longer lifespan they have a major advantage in that eyelets are built-in to the sides for wires to run through, so you do not need to hammer hook-nails in, as you do into wood posts; this saves quite a lot of man-hours.

Diagonal galvanised-steel ground-anchors can be attached to the end posts, or if you prefer to use large (4 to 5 inch diameter, 8 or preferably 9 foot long) kiln-dried and tanalised wood posts for the row ends, you can use a 'lintel' system: the first intermediate post spaced only one vine away, with a wood D-shaped 'lintel' half-round post nailed across the top between this and the end post. A strong diagonal wire (or 3 plaited wires) loops around the top of the post and then down to loop around the bottom of the end-post.

Voest - 'Leova' galvanised steel posts:-

Proven to be the strongest steel post, and the easiest to insert into the ground; especially with a Vibrator attachment added to the Pusher; they have to be pushed down rather than banged down.
    There are two types, hot-dipped-galvanised and band-galvanised (about 12% cheaper; we don't sell these as the lifespan is much shorter), the following prices are for hot-dipped-galvanised:-

Intermediate posts (maximum 6.0 metres between posts; 700mm recommended below ground):-
Type 50mm/35mm Plus, with external built-in hooks for the wires, minimum order 1000:-
    2.4 metres tall, 3.75 kilos each, 6.35 Euros each plus cost of delivery from Germany,
    2.5 metres tall, 3.9 kilos each, 6.59 Euros each plus cost of delivery from Germany.
    The above posts can be used on concave slopes with the addition of special black plastic clips on the side hooks; @ 50 Euros per 1000; at least 6 clips will be needed for each post.
Type 50mm/40mm I-plus, with internal built-in hooks for the wires, minimum order 1000:-
    2.4 metres tall, 4.25 kilos each, 7.19 Euros each plus cost of delivery from Germany,
    2.5 metres tall, 4.43 kilos each, 7.49 Euros each plus cost of delivery from Germany.
There is a 2.5% discount on the above prices for over 2000 posts.