Imac G4 And Motu 896 Options

I'm new to this forum, so I just want to say first, hi everyone!

I've been doing alot of reading about the new iMAC G4, with it's 2 firewire ports, 3 USB's and fancy adjustable monitor. It all sounds great, but I'm looking for some real world experience with this system using MOTU 896 w/ADAT sync running Digital Performer. I've worked with PC's and audio for a few years and I'm ready to step over to Macs. I've heard the power of the new iMAC G4 is not as strong as advertised (I read a review that said 32 track limit before plug ins, can this be right? ) Also, noisy fan?

The Dual G4's sound more impressive but they cost double with monitor. Is it worth saving the cash?Any thoughts?........