I have an E510 which is the US version of the 5150.  I've upgraded my video to a NVIDIA 8600GT, which does not require any power supply upgrade.  There are other cards available, but what I'm using.   Your system uses PCIe (PCI Express) type cards.

I see you only have 1GB of RAM.  You should also consider upgrading to 2GB.

My Favorite Is a Radeon HD4670

Wont hurt your power supply or your wallet.

Diamond 4670PE31GDT ATI Radeon HD 4670 GDDR3 1GB PCI-Express Dual DVI Video Card

http://www.microcenter.com/single_product_results.phtml?product_id=0298791

http://www.amazon.com/Diamond-4670PE31GDT-Radeon-GDDR3-PCI-Express/dp/B001NYUZ1G

http://www.newegg.com/Product/Product.aspx?Item=N82E16814103073

http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=4348739

Specifications

GPU/VPU:  RADEON HD 4670     Additional Features:  HDCP Enabled     OpenGL 2.0     DirectX 10.1     Game Physics Capable     ATI Avivo HD Technology, Shader Model 4.1     Video Memory:  1GB     Memory Type:  GDDR3     Memory Interface:  128-bit     Stream Processors:  320     Core Clock:  750 MHz     Memory Clock:  900 MHz     Interface Type:  PCI Express 2.0     Interface Speed:  x16     Connector(s):  Dual DVI (Dual Link)     HDTV/S-Video     HDMI (w/ Adapter)

My computer runs windows XP not Vista which is only compatibale with that Graphics card.

Is there another graphics card which will suit XP?

My computer runs windows XP not Vista which is only compatibale with that Graphics card. Is there another graphics card which will suit XP?

The HD4670 like all other graphic cards work with XP or Vista.