Apple Logic Pro /LogicExpress Discussion

Hey, I've decided to bite the bullet and get a new core duo iMac.  It 
seems that it will run 4x as many tracks/plugs/etc. as my 1.5ghz G4 PB. 
  Two questions though -

1. Does anyone know if there's any difference ordering online or buying 
at an Apple store?  I'm looking for the educator discount and a payment 
plan, but would love to have a computer in hand ASAP.

2.  My trusty RME Hammerfall PCI card is no longer usable on any Macs, 
so I'm left with a need for an audio interface with ADAT input.  I'm 
assuming my best/only option is Firewire, and there seems to be nothing 
under $500 with ADAT, except for some new Alesis io/14 thing for $300.  
Any recommendations?

Thanks,

Gregory