Help choosing tube monobloc's

At present I am running a Sunfire Tube Preamp and Sunfire Signature power amp.
I would like to introduce monobloc tube amps into the system.
The speakers are Kef Model Four~Two so they like to have power (I was thinking 150 wpc min.).
I have been thinking about a used set of Sonic Frontier power three's.
My budget is in the $5000.00 to $7500.00 range.
I mostly listen to classic rock, with a minor amount of easy listening, folk and classical through a Sonic Frontier Phono 1 tube amp (can there be too many tubes in the signal path) and Oracle table
I would appreciate anyones advise on tube monobloc selections.