I may be in the minority, but I owned the ZH270 & Joule preamp with the VSM's as well as the VAMP and the Thor TPA 30 mono block amps paired with the Thor preamp.
The best sound came from the Thor combination. Next was the VAMP. I did not care for the ZH270 and found it was a little lightweight for the VSM's which can sound thin if not carefully matched. I purchased the ZH270 hoping for a match made in heaven, but would say it was my biggest audio disappointment to date. I say this because I paid for a new ZH270 and it was big $$ for me at that time.
If your going to spend that kind of money, look to used Thor gear first! Great with the Merlin speakers. If you want great sound for little cash, then the VAMP is one that should be on your list.