need help choosing a graphics card

[its snoodles]

ok so im trying to figure out which graphics card to get for me its a toss up between the ATI radeon 5670, an ATI 4850, and a 9800 GT.

4850: http://www.newegg.com/Product/Product.aspx?Item=N82E16814150482

5670: http://www.newegg.com/Product/Product.aspx?Item=N82E16814150467

9800 GT:http://www.newegg.com/Product/Product.aspx?Item=N82E16814133304


DirectX 11 is not a factor in this i was thinking about it but there is only one game that uses it out and it cuts the 5670 performance in half, so now it just comes down to performance they are all the same price, give or take 5 bucks but the 9800 GT performs better than the 5670 and the 9800 GT has Physx but the 4850 is better than the 9800 GT at the same price and has no physx and i am currently running:

AMD athlon 2.8GHz dual core AM3 (upgrading to a phenom II sometime soon.
ASUS 880G micro ATX motherboard
2GB of DDR3 1333 corsair RAM (will be buying a second 2GB stick with the graphics card)
160 GB western digital SATA 3GB/S hard drive (upgrading to a 1 TB 6 GB sata drive)
575 Watt power supply (upgrading to a modular PSU not sure on watts)
LG DVD-RW drive all formats but blu-ray obviously

 

[Marshillboy]

Physx is generally a resource hog, and I wouldn't cry much over the loss of it. I have the 4850 and although it doesn't support DX11, it has DirectX 10.1 support and performs admirably on every game I've played (except crysis on 1920x1080 on highest settings).

A card with very similar performance to the 4850 is the Nvidia GTS 250, but I have not used this card so I cannot tell you much about it anecdotally:

http://www.newegg.com/Product/Product.aspx?Item=N82E16814134094&cm_re=gts_250-_-14-134-094-_-Product

 

[its snoodles]

yeah i was thinking about the 250, i have 175 bucks to get a graphics card and a 2 GB stick of ram and those 3 cards fit perfectly into my budget i was thinking of just getting 4850 just because it is the best performing because there is only 1 directx 11 game out there and with directx10.1 being run the 5670 gets around 50-60 frames but with directx 11 it cut it down to 29 so im not really worried about direct 11 atm due to the lack of games for it plus i have had very bad experiences with ECS and plus i would rather have 1 GB of ram from the 4850 than the 512 on the gts but i would also really like to have the gts because i am more of a nvidia fan boy than a ATI

i would rather have this one that the ECS one: http://www.newegg.com/Product/Product.aspx?Item=N82E16814500152


and another question what is the difference between directx 10 and 10.1 because the 250 gts only supports directx 10 not 10.1 whats is the difference?