I will NEVER use an Eminence, they sounded bad in the Line 6 Flextone 1, and TERRIBLE in the Fender hot rod Deluxe/Deville, that fender is very MID heavy and Harsh, Ice picks glassy highs that stabb you, they jump out, a Mid that sounds like a half open wah and a woolly booming low end. I don't know how much is the amp, and how much is the speaker, but it has put me off Eminence.
The only speaker I would try instead of the MC90's-which are great speakers I think, are the EVM12L.
I don't like any other Celestions from what I have heard apart from the CL80, but I think apart from the EV, the MC90 is the best speaker available.