HI Erik,
Those Prima Luna's appear to be push pull KT-88 amps?
My personal preference lies with 300B Single Ended amps, and thats why I picked the Glasshouse, as it is to my knowledge the best value for money 300B single ended amp in Britain at this moment. If there are others for less, I dont know them. I also know the company and know that the parts/construction quality are high.
When it comes to push pull amps, there are a lot in the 400-1000 pounds mark, and from your good experiences it sounds like the Prima Luna amps are worth auditioning for someone in that market.