Need help with new card?

[DeathSmasher]

Ok heres my deal. I currently have a 7800GT 256mb that is going bad so what should i upgrade to? I run a 19inch monitor an i was happy with what the 7800 was capable of doing but would like a bit more. I have access to a 8600GT 512MB card for cheap would i be happy with this for the price? "around 120 bux" Or what would you recommend? Any help would be great an i thank you now if you post help.