tubes & Hales Rev 3s

Rebuilding my system. I have left over from my last system a pair of Hales Rev 3s and plan to continue using them. Pre-amp will be a Channel Island passive and a Cal Icon Mk II pushing the whole thing around until I can get together the cash for a nice SACD rig. Anyway, I'm thinking that I may try tubes this time, but I'm having inner doubts about how much power I will need for the Hales. I previously use a Classe CAP-150 for power. Any help or advice will be appreciated.
As long as amp is >100wpc, you should be OK. off course if you do not have super-large room and expect to fill it up with near conert levels.