Can't capture it any better than DVCPRO HD. You can finish in a higher format, if your client requires it. But with the aid of a good capture card (Kona 3) you don't need to work with any better format than DVCPRO HD.
Just get a Mac Pro, a bunch of internal drives for the sleds and work away.
Oh, and watch this tutorial:
http://forums.creativecow.net/cgi-bin/page_wrapper.cgi?forumid=8&page=http:...
Needs to be updated for FCP 5.1.2, but it is still valid on a lot of points.
Shane
FCP Preferences set to UNCONTROLLED ADVICE
Littlefrog Post
http://www.lfhd.net