Dell Inspiron 545 Graphics upgrade

[waffledude]

Hello,
I am a little bit of a beginner at hardware so please excuse me of i make a mistake. So I had got a Dell Inspiron 545 with a GT 220 (I did NOT want that card) and a creative Xi-Fi Extreme Audio sound card, but i sort of hated the fact that that i had a HAF 932 cabinet, a corsair TX 750W PSU and a H50 CPU cooler. So i transferred all the stuff in the Cooler Master HAF 932 with the TX 750 and the H50 cooler.
The problem being faced right now is that the Dell Motherboard has only one PCI-E x16 slot and the min PCI right below it hence to install a double slotted card it would involve removing the Sound card. The exact Spec of the PC is as follows:

Processor: Intel Core2 Quad Q@2.66GHz(4 CPUs), ~ 2.7GHz
Motherboard: no idea except i know that its a Dell Inspiron 545 of with the chip-set is either Intel P35/G33/G31
Ram: 4GB DDR2 800 MHz
Sound Card: Creative Xi-Fi Extreme Audio
Display Device: Dell S2209W - LCD display - TFT - 21.5"
GPU: nVidia GT 220 1 GB
PSU: Corsair TX 750 Watt

Can any one suggest a good graphics card within $200 preferred single slot but I don't mind removing the sound card for a double slot card.

Thank you

 

[xerb]

Radeon 4850 is a single slot GPU and is a high-end GPU.

http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=757276&SRCCODE=GOOGLEBASE&cm_mmc_o=VRqCjC7BBTkwCjCECjCE

http://www.mobilepc.com/Electronics/XFX-ATI-Radeon-HD-4850-1-GB-DDR3-PCIE

 

[waffledude]

Just out of curiosity... If i do but a 470 GTX in there and use onboard sound... the GPU woudn't bottle neck would it?