Ok my Acer Aspire cant run LFS without over heating fast so i want a PC that can run lfs over 80 fps no problem i dont need moniter or mouse/kb just the pc and need it cheap im also willing to sell my ipod touch and my laptop any suggestions
More ram will only help if LFS uses all available ram you have atm. But I think CPU and graphics card are more important, so I'd go for a self-built rig. Because if you do it right, they're cheaper, and they're better for when you want to modify them or add/change other components.
I put the heatsink from an XPS M1710 on my Ati X1400 (X1400 comes standard with a single copper pipe, the XPS higher end cards have two copper pipes; however I'm using a pipe from an older XPS so I didn't get to upgrade my graphics card and I don't feel like spending $500 on the fastest one for my laptop if they keep having severe issues) in my E1705 and can O/C my card by almost 35%, get a few artifacts during break in periods but only for about 3 minutes until the card warms up.
Take apart your laptop and put on some Arctic Silver 5, then get a cooling pad or build your own and you won't have any issues.
I'd suggest OCZ Freeze, as it doesnt require the break-in time AS5 does, and it's non conductive so if you put a bit too much on it won't harm your laptop.
AMD Phenom II 550, Corsair 400cx PSU, 9600gt video card (or 4670), Gigabyte ga-ma770-ude motherboard, 2gb ddr2-800 nothing fancy, keep your old hard drive, and a cheap case like the antec 300.