Switching Rotor Types

I currently have Avid Juicy 3 brakes. I'm thinking of getting some hand-built wheels (due to spokes breaking in my factory set) and I like the price of the XT hubs. If I were to change the hubs to centre lock instead of 6 bolt and change the discs respectively will they be a direct fit into the existing juicy calipers?
Specialized Rockhopper '07
Trek Fuel EX8 '09
Trek Fuel EX8 '09
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Parktools :?:SheldonBrown
I'm set on the XTR hubs now, but should I go for DT Swiss 5.1 or ZTR Arch rims?
I'll be running standard inner tubes so is there a need for notubes ZTR rims? Can you still use inner tubes with them, i.e. do they have a valve hole? How is this plugged to run tubeless?
Trek Fuel EX8 '09
D'oh!
Trek Fuel EX8 '09