How much is a good graphic card?

I have a Windows Vista Home Premium Service Pack 2. (SP2) AMD Phenom(tm) 8550 Triple-Core Processor 2.20 GHz Memory (RAM) 6.00 GB It's a 64-bit Operating System Here's a picture of the Base Score --> http://prntscr.com/dg6tt I might get a new graphics card because the games I play are beginning to... show more I have a Windows Vista Home Premium Service Pack 2. (SP2)
AMD Phenom(tm) 8550 Triple-Core Processor 2.20 GHz
Memory (RAM) 6.00 GB
It's a 64-bit Operating System
Here's a picture of the Base Score --> http://prntscr.com/dg6tt
I might get a new graphics card because the games I play are beginning to lag quite a bit and setting everything on low settings isn't really helping. (I play Sims 3 with 4+ expansions, Combat Arms, I might re-install Sims 2. Which Graphics card would I need that's good for gaming, and how much would it cost?
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