When I posted that I had bought an 8800 gts 640mb SSC yesterday, everyone was like why? I got mine for 80 USD which I guess fits into thogroms "eh" category. Its sounds like you've got more more funds then me so you might as well go for the newer tech.
for 80$ it is eh.... there isn't anything really BETTER per say in that category... but its old tech at that price point with new tech starting to pop in at that price point and at that performance... thats why its eh
50$ is a great buy though... if you wanna buy mine again... pm me :P
I'd say that's a good deal. A 9600gt, which cost more than that, performs about the same as stock g80 8800gts 640mb, and lower when oced. "New tech" or "Old tech" is irrelevant, they have no merit in and of themselves. Bottom line is performance/value.