Hi Mushy, Recently sold a Sony SDR-DN1000 and Jamo 102 speaker package to purchase a Yamaha YSP-2200.
Can't speak for the Bostons but my Yamaha ' Walks all over' my old set up. Very, very impressed. Fantastic spread of effects, cohesion, rich warm sound, and thats in a room it shouldn't work in!
You could offer me £500 and the kit above and i wouldn't swap it for my new soundbar. Can't see the point in going for style system seperates again. Can't speak for you're room design but as i have found out and noted in the WHF review the bar is pretty flexible regards placement.
However if you need to connect Component or composite kit then you may need to look at an amp anyway.
Good Luck