I've never heard any Bose speakers, so can't comment on their quality - though it wouldn't surprise me if there was a certain amount of speaker snobbery around!
Being more positive, I'd suggest you keep them even when you do upgrade - perhaps for rear speakers if you upgrade to a 5.1 system.
That crystal Xbox you have will sound a lot nicer with DD5.1 - even disregarding the actual sound quality, the directional effects will be cool...
That's one of the benefits of a separates system, you can upgrade when your budget allows.