Been on the fence for awhile about upgrading my PC a bit, and I think I'm finally going to buy some hardware. But, I'm worthless. Need help.

According to Lavalys/Everest, I have:

DualCore Intel Pentium D 805, 2666 MHz (20 x 133)
Dell Dimension 5150/E510 Motherboard
Intel Lakeport-G i945G chipset
1.00 GB RAM
ATI Radeon x300/x550/x1050 Series Secondary (128 MB)
ATI Radeon x300/x550/x1050 Series (128 MB)
ATI Radeon x300 SE HyperMemory (RV370)

..which isn't horrible. I know my graphics card is pretty bad, and I could use more RAM for sure. Basically what I was wondering if you guys had any suggestions, or maybe know of where I can find the best deal (online or not). I also don't really know what kind of hardware is compatible with my current shit. :/

I'm looking to spend maybe $200 for some RAM and a video card, maaaybe more, depending, preferrably not though. If I could get something good for less than that, that'd be sweet too.

Kind of want to get some games. Pretty sure the newest PC game I own is Guild Wars. :/