My favorite for the 2Ces are the BEL amps. However, there are others out there that will satisfy different tastes. For the same money as a Bryston that is. Many threads have been written on this so you may want to do a search.
As for the Quatros, you won't be disappointed. Just make sure to have some patience while they break in. They're a huge step up from the 2s!
Good luck!