Thanks for all the advice.
I'm pressing for a P4 3Ghz, which is about R700 (about $100) more than a Celeron-D 2.8Ghz.
I was wondering if there is an online source comparing the two in performance? Could you point me in the right direction?
PS: I'm having difficulty replying to posts- the server tells me I'm not logged in, even if I do- any idea what's wrong?