Upgrading från Nvidia G210

[Cmars]

Hey guys, I'm going to buy a new graphic card because mine is like ... Not that good of a graphic card for a gamer, I'm trying to find one that cost at a max 1,500 any recommendations? Because I found one with some nice reviews "XFX Radeon HD 5670 1GB GDDR5" or "Sapphire Radeon HD 5670 1GB GDDR5", I got a computer with 4 gb ram W7 Ultimate 64 bits with a AMD Athlon 7550 Dual-Core Processor 2.50 GHz, so yea any recommendations on any graphic cards that doesn't cost 5 million?