If you do this, assuming the Desktop (Pro) Intel Macs are coming this Christmas, you should be up and running by this time next year, almost grief free. That's basically how I'd do it, so unless you have a reason to get the latest versions of everything, have patience.
On another point, am I remembering a dream, or did I hear awhile ago that MOTU was secretly running a PC version of DP down in the basement in a back room? I think it was supposedly because Apple's future was allegedly in doubt, and they were trying to be prepared for any contingency.
If that was ever the case, MOTU may be futher along heading toward Intel land than anyone suspects.
Anyway from my experience MOTU tries to be careful about releasing DP. They seem to try to wait until they have all the basics working before they put it out. Meaning that, for new users they can get started using doing basic recording, and for existing users, they can get started testing basic setup and functions, while migrating to a new system.
Sly

P.S. To you guys whose systems are slowing down because you're using more VI's and newer Plugin's. Try committing more tracks to disk. Think of it as having a real musician play the part. You would RECORD the performance, not have HIM/HER play it everytime you hit the play button. Even a stressed out G4 should be able to play back 24+ tracks.
Remember there was a time when it wasn't possible to do EVERYTHING you could wildly imagine on a computer.
Oh! Wait a minute! It's STILL NOT POSSIBLE to do everything we can possibly imagine on a computer!