I need advise on amp upgrade.

Pass x-250

I would vote for either the pass x-250 or cj mf2500a.

I would actually replace your preamp before replacing your amp. There are MUCH better preamps out there for similar dough than your M3A. In fact, I purchased a cj PFR which, in my opinion, blew away the M3A in tonal accuracy, rhythm and pace, and most of all, musicality. Keep your Bryston; get a new preamp instead.

However, if you are convinced about replacing your amp, the GamuT wins in my book. The Plinius is second. Both these are very musical amps and neutral to the source.

Good luck.

KRELL!
Best bang for the buck, in my not so humble opinion, is a used Krell FPB300.

Richard

Hello, If the speakers are efficient,the Gamut is good.However,if not you will tax this amp.Between the X250 and SA-250,the X250 will sound quicker in the top-end with the Plinius adding a little sweeter treble.I prefer PURE CLASS A operation,but the X250 has a fair amount of this to offer,then switches to AB for high power situations.Good luck! Tom