I just upgraded the ram and video card in my Dell Inspiron 5100, so I have 2 sets of 256mb DDR 200pin SODIMM Ram and an ATI Radeon 7500 Mobility 32mb for sale.
Here is a description of the ram-
DDR PC2100 • CL=2.5 • UNBUFFERED • NON-ECC • DDR266 • 2.5V • 32Meg x 64
The ram and...
I run a Dell Inspiron 5100 for gaming. It does ok. I just upgraded the ram to 1024 and the video card.
I have a friend who got a Dell XPS, and it's great.
Find a guide like they said.
I go to the local computer shows in my area, they sell stuff for great prices.
Also pricewatch.com is a good place to go to buy parts.
If you can turn a screwdriver, you can build a PC.