Rick,
You definitely want to use the recommended tools for this stuff. The wire is under a lot of tension, and it remains under tension after you've tied it off or spliced it. Stretcher bars made from 2x4s won't be able to hold the wire well enough to tigthen it well. You might be able to get away with come-a-longs instead of the chain grabs, but the advantage of the chain grabs is that they have a
much longer reach (20') and if something breaks when you're tensioning I think it'd be safer: chain doesn't recoil when it breaks; steel cable does.
That said, there's two companies that manufacture high-tensile woven wire (Stay-Tite and Bekaert), and several that manufacture the tools for it. If you've only looked at Stay-Tite's tools and wire, shop around some, because they're on the expensive side. Kencove Fence (
www.kencove.com) carries Bekaert wire and non Stay-Tite tools and is an online price source. They have the best prices I've found on crimp sleeves and some of the other hardware.
Also, the dealer you buy from may loan out the tools. Mine sold me the tools (stretcher bars and chain pulls) at cost, with an offer to buy them back when I'm done.
As for other suggestions... Don't scrimp at all on the braces. Make sure you meet the manufacturer's recommended minimums for the post diameter, depth, and cross-brace length. I built mine to spec; 6" minimum diameter wood posts set 5' in the ground (the bottom 3' in solid rock) with a 14' cross brace. After I tensioned the fence, there was a 1/2" gap between the brace posts and the soil on the side opposite the pull. The braces are the most important part of the fence.