Have a read through the owners thread:
ONKYO TX-NR609 Owners Thread *Part 2*
There are also threads on the Bostons in the speakers forum.
If you were going to listen to music, I would be tempted to get a full sized speaker setup up front using bookshelf speakers and matching centre. The likes of Tannoy Mercury V, Wharfedale Diamond and Q-Acoustics 2000 series are the usual budget options. MA Bronze are also worth a look and quite a few people partner MA with Onkyo despite some saying that it shouldn't work due them both being clinical in nature. A demo is the best way to ensure you are happy with the sound.