Tube Amp Recommendations

Dear All
Can anyone recommend suitable tube amps to use with Merlin TSM-MX Speakers. I have not yet finalised the budget so a range of selections from US$1,000 upwards (perhaps to US$6,000) would be much appreciated - including those which can then be upgraded at a later date with the addition of power amps/monoblocs. I was considering the Audiopax Model 5 (I now it is a solid state) with a future purchase of the Audiopax Stereo 88 tube amp just to give an idea.
Many thanks
James