Sorry to say, that for the "musician-on-the-go" of tomorrow, will probably be content with a mobile "wiz", like the forthcoming Pads, Pods, (Phones and cameras included, of course), perhaps for ABOUT a comparable price to a "music-set-up portable...that just "Might Not"...have near the creative potential of that small gizmo, that might be available by Xmas, with all "cloud stuff" possibilities, on the horizon!
I've got a beauty of a Toshiba Qosmio Portable gathering dust...three desktops, that are "confined" to my humble abode...
but I do have an old 3rd Gen. touch Ipod with 25 Gigs of memory that's "joined into--and a part of... my one Terrabyte Seagate...BY USB...quite a potent low-priced "tool" to "lug" up on stage!?
Like Mr.Job of Apple has recently

said, and I'm paraphrasing, "Computers won't have to worry about internal software, per se, but how the mobile software they're holding will
communicate artistically, musically, with instantly possible creative tools "in miniture hardware of the future"....
With Lion and Cloud and streaming everything "coming from the heavens", all we'll need
is a little warm "gizmo" WITH BALLS!!!