Currently i have a dell

pentium 4 2.8 ghz
1.5 gb ram
150 gb hardrive
good internet connection

i can only bot one char at a time with this computer.

i want to buy a cheap computer on which i can bot at least 3 chars at a time.

What should i look for?

More Ram?

Better Hardrive?

Better ghz?

also what processor would be good?