What video card will work with my motherboard?

I have on board video right now but I want to add a video card to my system. How do I know what kind I need.

Here are my specs:
Motherboard:
CPU Type AMD Sempron, 1600 MHz (8 x 200) 2800+
Motherboard Name Biostar GeForce 6100-M7 (2 PCI, 1 PCI-E x1, 1 PCI-E x16, 2 DDR DIMM, Audio, Video, LAN)
Motherboard Chipset nVIDIA GeForce 6100, AMD Hammer
System Memory [ TRIAL VERSION ]
DIMM1: Corsair Value Select VS1GB400C3 1 GB PC3200 DDR SDRAM (3.0-3-3-8 @ 200 MHz) (2.5-3-3-7 @ 166 MHz)
DIMM2: Kingston K [ TRIAL VERSION ]
BIOS Type Award (09/20/05)
Communication Port Communications Port (COM1)
Communication Port Printer Port (LPT1)

Display:
Video Adapter NVIDIA GeForce 6100 (256 MB)
3D Accelerator nVIDIA GeForce 6100
Monitor SyncMaster 932GW(Digital) [NoDB] (HVMP601727)
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Any guess would help. Thanks again.

 

any card that is PCI-E x16 will fit fine. Just make sure you have the room in your case for a new card. The larger 8 series cards are BIG. I bought an Evga 8800 GTX and almost fell off my chair when I pulled it out of the box, it's huge! And make sure your PSU has the correct connectors for the new card you will buy. You can get adapters for power cables. Most new cards take two 6 pin power connectors, some really high end take a 6 pin and an 8 pin. Your processor will bottle neck your graphics card, that proc is SLOW! What is your budget? That's the real question. I recommend this card, with the other hardware you have, this will work good for you. It's a low end card by today's standards, but it will leave your on-board card in the dust, and it's a good price. My brother in law uses this card and plays all kinds of games.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130035

SCOUT69
Xion II case
Asus P5N-E nForce 650i motherboard
Intel Q9300 2.4 GHz Quad Core
Evga 8800 GTX
Corsair XMS2
ANTEC 650w PSU

 

Thank you for your recommendation. Our budget is up to $200, because we just need it so my husband can run his computer games on it. He has a few that the on board will not play. But when I got the system it was just for me, and since I dont game I didnt need anything much. We have a mid sized case.