well you can skimp out on the CPU as EQ2 only takes advantage of 1 core, so id reccomend i higher end single core AMD Athlon (FX if you can afford it).
ABIT, and ASUS both make reliable inexpensive Motherboards for around 100 bux
Videocard id go with an Nvidia, if you can find a used 8800 for not too much go with it.
Powersupply, go Antec... most reliable out of the rigs ive built so far (gonna be about 50-100 bux depending on where) get atleast 600 watts.
Ram, 2GB of whatever value ram you can get pc3200 is usually cheap as is DDR-2.
Maxtor or WD for hard drives, again price varries as far as speed and storage size...
Check out
Newegg.com - Computer Parts, PC Components, Laptop Computers, Digital Cameras and more! and
[H]ard|Forum - Powered by vBulletin (tech forums) for some stuff going around, find what you want on newegg and see if its on [H], if it is my bet is it will be less expensive, and hardly used.