Home Theatre in-ceiling speakers?

We're rebuilding our home and trying to figure out how we are going to lay out the den. Too many options and no decision until we play with the furniture lay-out.

But the walls are open now and I plan on running some speaker wire in the possible speaker locations. The wife would like these speakers to be unobtrusive, so in-ceiling's are a real possibility for the surround's.

Any suggestions that won't break the bank and still sound decent for home theatre? My multichannel home theatre setup is decidedly mid-market (Kenwood 6.1 receiver/processor, Sony carousel DVD, etc.) so I'm not looking at the high-end here.

Thanks,
Bob