NV30 will be very lucky to have any kind of availability by the end of Dec with solid info mid-Nov (as
Sub51 said), and I'd expect prices to be very high too. If you have a decent gfx card like a Rad8500, GF3 or GF4TI then there's little point upgrading until we see how NV30 fairs and prices compare, obviously it will also be interesting to see Rad9700PRO-DDRII and Trident XP4.
The 'Golden Samples' are better as they use the same RAM that all the other basic 4200 cards do, so they really don't deserve their GS tag unlike back in the GF3 days. Gainward are a very well respected co with good products and from what I hear good cust support, but making their std 4200 with crappy RAM to make the GS look golden is a bit below par. On a brighter note with Gainward you are assured good build quality and image quality (although IMHO this is now a non-issue for GF4TI cards) plus their 4200 cards do tend to get among the best core o/c going (by like 20mhz LOL!). If you go Gainward go GS but do consider the other brands too.