Graphics Card suggestion?

Hello and I was hoping to get some suggestions from people with more knowledge than myself with hardware. I purchased and put together a Barebones kit and am fairly disappointed for the time being with it's performance. I know enough about computers to be dangerous and would really appreciate some input! I am an avid gamer and would really like to be able to play the upcoming Battlefield Bad Company 3 when it's released. As of right now i'm lagging on Lord of the Rings Online with the settings on low. The specs on my computer are:

OS: Microsoft Windows 7 Ultimate 64 bit
Direct x 11.0
CPU Type: QuadCore AMD Phenom X4 9100e, 1800 MHz (9 x 200)
Motherboard: Biostar N68S+ (2 PCI, 1 PCI-E x16, 2 DDR2 DIMM, Audio, Video, LAN)
Motherboard Chipset: nVIDIA nForce 7025-630a, AMD K10
DIMM1: Centon Electronics MICT38UXB 2GB 2 GB DDR2-800 DDR2 SDRAM (5-5-5-18 @ 400 MHz) (4-4-4-12 @ 266 MHz) (3-3-3-9 @ 200 MHz)
Video Adapter: NVIDIA GeForce 7025 / NVIDIA nForce 630a (128 MB)
3D Accelerator: nVIDIA nForce 7025-630a

Any help/suggestions would be greatly appreciated!! I'm planning on getting another 2gig stick of ram and need to purchase a new Power-Supply for the future graphics card. For some reason the Power-supply that was part of the Barebones bundle was junk. After sending in and receiving two more of the same power-supply I ended up having to put in a much older, lower watt powersupply. Again thank you to all in advance!
-Jordan

 

Only 2/4 gig RAM with 64 bit O/S? You could eat up 8 gig easy.. but even 4 should show some improvment, but the question is is it worth it just to go for 8 gig now as you only have 2 slots