Three things. First, I'm not a D70 owner but I'm sure that you can get pretty close on the white balance. It will probably be a bit warm -- but if this is a beauty kind of light, then that's a GOOD thing.
Second, if you shoot RAW you can adjust the white balance outside the camera. That's a good alternative if you're doing studio work. I hope you're not taking this monstrosity on location!
Third, I have been experimenting with the Reveal and similar bulbs. It doesn't cost that much more -- and my opinion is that it would be worth the $15 - $20 or so to go with the daylight bulbs.
I guess one other thought -- I'm always the safety monitor around here -- that thing will not only be heavy but also get pretty HOT. PLEASE be careful about whatever diffuser you use that it doesn't catch fire. Remember to bore a few holes in the backboard for heat relief. And the heat may cut down on bulb life as well.
"Daylight balanced" fluoressant tubes -- a little warm, but I like it!