I think that given the pretty big size of your room, you'd want to look at a KT88 or perhaps KT120 (tube) amp. I much prefer the musicality of KT88 tubes, but that is somewhat of a personal preference. Tube amps that come to mind are from Primaluna, Rogue, Erhard Audio and perhaps even BlackIce-Jolida. You can go the integrated route, or get a power amp which requires a separate preamp. I don't think EL34 or EL84 tubes would provide sufficient power to fill your larger listening area.