The "cheapies" from Tapco, as long as they are surplus synthetics, would be fine, just don't expect pristine examples. Most FAL's around the world were used pretty hard.
The DSA handguards have gotten alot better apparently over the years, some of them wouldn't line up right at the top where the screw went, and you had to use a little judicious force with a hammer to align them.
Currently, no real bitching about the new ones, and they count as a US part if you wanted to use a foreign part on something that is currently US made on the rifle.
You might also consider getting a walnut buttstock or a synthetic "humpback" style. I prefer them to the Austrian straight comb stock, which is alot like a HK G3 stock. Doesn't fit me AS well, although it certainly isn't "bad". The humpback style just fits me much better.
Here's my StG-58A before and after the intsallation of walnut furniture.