Newegg sucks. Old, goto
http://www.pricewatch.com
for a case, get at least a 300W power supply, 350 if your going P4. It should have at least 2 5.25 bays, and 2 3.25 bays. My best suggestion are these two:
Price: Antec SX630II -
http://www.pricewatch.com/2/74/960-5.htm (4th from bottom)
Best: Antec Plus660AMG -
http://www.pricewatch.com/2/74/960-10.htm (4th from bottom)