Track count?

[JFreak]

hi there.
in your experience, what kind of track count i should estimately expect using a year-old 667mhz tibook as a protools host? i'm planning on buying 002r and maybe an additional ad/da converter wishing to record 16trk at once, but i'm wondering if the laptop can handle it... i have 1gig memory and will definetely buy an external firewire-hd as well, but is there enough power in the processor and overall system? i think in theory i should be able to record 16trk simultaneously, but is it only theory?

(and further: if i had TWO of those 002r:s and ad/da:s having theoretical 32trk i/o-system, how much processing power is required to utilize them all? need to wait g5-laptop?)