Im with Oliver. Computers are better for everyday use, aswell as botting.
With $500 you can build a pretty solid rig, but if you pumped your budget up to say 600 ish, the improvement is real.
Ive got a computer in the waiting. Ordering the parts every time i get paid. Spent about £300($450) atm
Edit: Heres a similar build to mine. http://uk.pcpartpicker.com/p/8tmWsY