What graphics cards work with HP pavilion slimline S5206UK

[polo3400]

I know i can only have low profile graphics cards. I am buying a new graphics card and want to be able to play Starcraft 2 in high/ultra settings. Can anyone provide me with a link? my price limit is £100

Windows 7
4GB ram
2.44ghz
Intel pentium
duel core
Intel express chipset G41

I measured the length it would have to be - 9cm max (inc. Bracket) (i think)

If any other details are needed just ask

Thanks in advance