Logic Express On An Ibook, iBook for affordable portability Options

[OneDerBoy]

I am considering the purchase of an iBook to run Logic express 7. Can anyone tell me how well this will work if I intend to record no more than 12 tracks per song. Also will 768mb be sufficient ram?

Given the recent anouncement of the "Mactel," I am hesitant to buy an expensive new iMac for my computer needs. I am most interested in the powerbook, but affordability is an issue, particularly since they will be greatly improved in the near future. The iBook would be a stop gap for the next year and a half or so, but what performance can I expect?

All your help is greatly apreciated. Thank you.

[OneDerBoy]

I'm currently using a 1GHz Powerbook with no problems, most projects are 32-48 stereo tracks.

I use soft synths exclusively, along with the "freeze" function.
768MB RAM, all audio is on an external 7200rpm firewire drive.

Thank you so much. From what you're saying I assume then the newer iBooks at 1.25ghz or so will function well. Do you know of any other hardware limitations the iBook has compared to an older PB? And forgive my ignorence, but what are soft synths? Software synths? (yes, I am quite new to this)
Do you recommend a seperate external hard drive as a necessity? Or just for larger projects?