These speakers are not outstanding but do not judge soooo hard KEGGER. I think the bose speakers do a good job with a cheap receiver which has a digital output. So the sound weakness of the amp can be evaded. But sound wise you would not get any added value with an amp upgrade in the future.
I just heard a quite expensive Bose set at a dealer, and it was just as bad as I remembered. There's really no reason to defend the Boses. Even Creative Gigaworks computer speakers will outperform Bose systems, and they're much cheaper and about the same size.