What preamp & power amp to buy?

A quick search of Virtual Systems on Agon showed systems where Rockport speakers were paired with Boulder (mentioned above) and also Gryphon monoblocks. Might also be worth auditioning or asking Rockport about these.

Good luck, your "problem" is arguably one of the better ones to face!

If cost is no object then IMHO I would flying out to all the Rockport dealers to see/hear what they are paired with and assess the performance.
If you can afford a 100K worth of electronics I am not sure what you are going to glean from this forum - I doubt that many people own equipment in that stratosphere.

Please do not take this response in a bad way - but if you do not have a budget relatively speaking... a trip to a few dealers makes more sense to me then advice here.

J. Valin of the AS reviews all sorts of products in that echelon.

BAT Balanced Audio Technology - NT

05-14-11: Syntax
Go to Lamm Industries. They have the best sounding gear.

I second the recommendation for the LAMM products.

The Herron M1 Mono amps and VTSP 3A tube pre will get you world class sound without emptying your account if you do not have power hungry speakers.