Yes, I've run my 2Ce Sigs as stereo and mono powered speakers. My favorites in the "reasonable" cost category are the Quicksilver V-4 Monoblocks and the BEL 1001 MkV stereo amp. Both will rock the house and be reliable. No need to bi-amp. Just get a good run of bi-wire cable for either set up.
Cheers,
Mike
Cheers,
Mike