Merle,
I have a pair of Harbeth C-7's, a T-7 preamp and a Fet Valve 350 amp.  To give you some perspective, I owned AVA solid state gear prior to this set up running a pair of Rogers speakers I have owned for 20 years.  I have always felt at home with British speakers and the Harbeth's seem to have the warmth with a bit more lively kick.  Anyway, my recommendation would be to go with the T-7 or 8 or whatever the new tube preamp is going to be called and save a few bucks and go with the Omegastar amp.  I felt my T-7 had the bigger improvement impact than the Fet Valve amp.  In another 20 years I might consider an upgrade.  Frank might be in the cable business by then!
Todd