Which one of these graphics card is the best?

I am building a desktop at hp.com. I will be using it to play X-Plane Flight Simulator v9.0
I am choosing Core i5-750 processor with 8GB RAM

the 1GB ATI Radeon HD 4850 is the better card.

The extra memory on the nvidia gtx 260 is just a gimmick. You don’t need that much memory on a video card unless you have a huge screen with a really high resolution.

The GT 220 is just a rebranded/renamed 8600gt(I think. I know the gts 250 is the 9800gtx/8800gt).

And the 4650 is a decent card but it’s not as powerful as teh 4850

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