mewsickbuff,
i own the Monitor Audio GX300's and it might be worth while for you to listen to the Linear Tube Audio ZOTL40. It is a David Berning OTL design. I see you are talking about Pass Labs so maybe not looking for tubes but this is so fast, it sounds like the best solid state I've ever heard. Plenty of power for the 90db 300's.
i own the Monitor Audio GX300's and it might be worth while for you to listen to the Linear Tube Audio ZOTL40. It is a David Berning OTL design. I see you are talking about Pass Labs so maybe not looking for tubes but this is so fast, it sounds like the best solid state I've ever heard. Plenty of power for the 90db 300's.