Ibook/powerbook??, which is best for audio production.. Options

[Dr. Gonzo]

Howdy all... this is my first post on this forum, so please don't rag on me for the stoopid questions
okay, basically i've been running a PC with cubase/reason for the last couple of years producing psy, breaky stuff and chill out, and was getting pretty handy with it until my PC died and went to computer heaven..

...being a cubase user i've always been a little jealous of those who run logic as it seems to me like a kick ass sequencer..
sooo, now im thinking i'll invest in a apple laptop (i had a couple of apples as a kid and loved them, but haven't used one since). however, im on a pretty tight budget being a student and having just travelled for the last 3 months so the options are basically a 15" ibook, 1ghz (i think) and i'll upgrade the ram to 512 at least, or a reconditioned 15" powerbook G4/867, and again id upgrade it to 512m/ram.

NOW, the real questions:

1: will either of these be capable of running logic 6 or 7 with maybe 5-10 vsti's, and maybe 6-10 stereo tracks of audio and a few midi tracks?

2: why would i buy an older slower powerbook, when the ibook seems to have mostly the same functions and runs faster?

3: does this whole thing seem like a good idea, or should i just buy another PC laptop which is cheaper, faster and has better software compatibility?

Thanks for any help all.. 'tis appreiated

[Pipeline35]

The latest and greatest bang for the buck is the announcement that Apple is shipping a SINGLE processor 1.8gHz G5 tower for around $1400. Kick butt! Towers rarely run out of holes to stick stuff.