Powering ProAc Response 2.5's

Hello all. I'm considering purchasing a used pair of ProAc 2.5's to replace some Vandersteen 2ce Sigs, and I need some advice on the amp/pre-amp combination. What I already have to work with is a Musical Fidelity A-3cr amp/pre combo, as well as a Rogue 66 preamp. What do you think - will the Musical Fidelity be adequate, or am I buying to much speaker for that setup? It seems like many people favor tubes for the ProAcs. Would I be better off using the Rogue for my preamp with the MF amp*? Also, if I were to go with an all tube setup and keep the Rogue, what would be a good, reasonably priced USED tube amp to drive the ProAcs (e.g. $1000-$1500)? Thanks for your opinions.

*PS - the Rogue is reported to be a phase inverter. Do I need to compensate for this?