Depends on your future needs. HDMI? TrueHD/DTS MA decoding?
I see no reason to sell the Bose if you like them. Friend of mine had an accoustimass system and it sounded ok. I would guess the overall frequency response could be a bit compromised due to a potential lack of mid bass between the woofer and the small sattelites. One source claims from 200 to 280hz, but cites no testing.
Of course, Bose is close to the most hated brand on these forums, so expect few posts offering to help you with your actual question. They apparently want to spend your money for you