Personally, I'd look at an iMac G5 and 2nd hand iBook combo until the Mactels come out. Then you can have a dual-boot laptop, and can run all flavours of editing package on one laptop.
If you're using Avid for editing, you'd want a desktop with two monitors anyway- editing on one screen can be a nightmare, whereas FCP works just fine on my iBook's 14in screen...
Personally, unless you are a professional, broadcast-standard producing video editor, you don't need the extra performance. Any pro editor I've worked with has been quite happy to use FCP on a PB for editing in the field, and PowerPC-based Avid suites in the studio. I've made numerous project on my 1.33ghz, 768mb iBook, and havn't had a problem with rendering. IMO, if you havn't used cutting edge technology, you won't notice much of a difference.
If you're using Avid for editing, you'd want a desktop with two monitors anyway- editing on one screen can be a nightmare, whereas FCP works just fine on my iBook's 14in screen...
Personally, unless you are a professional, broadcast-standard producing video editor, you don't need the extra performance. Any pro editor I've worked with has been quite happy to use FCP on a PB for editing in the field, and PowerPC-based Avid suites in the studio. I've made numerous project on my 1.33ghz, 768mb iBook, and havn't had a problem with rendering. IMO, if you havn't used cutting edge technology, you won't notice much of a difference.