Bi amp configuration...a mismatch?

I just recently acquire a pair of Vandersteen 2ci and currently I am using a B&K ST2140 amp to power them. I am planning on getting the Audio Research D70 for a bi amp configuration and my first attempt to tubes in my system. I have a Rotel pre to drive the amps since this model has two preouts. My question is s, do you think their is a mismatch with the amps and preamp to drive the Vandersteen? Thanks