If you're going for an all in-wall system, then this is the only way to go for the subwoofer!
http://ibsubwoofers.proboards51.com/index.cgi It's called an infinite baffle subwoofer and from what I've read, they rock. Of course, you need to be handy with power tools, or know someone who is.
Craig
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Eclectic Gear:
HTPC
Outlaw 990 preamp/processor
NEC XG110LC CRT projector
Hafler SE240 pwr amp(2)
Hafler DH220 pwr amp(2)
Magnepan 1.6QR mains
Snell Acoustics EII surrounds
Magnepan SMGc rear surrounds
Velodyne CT150 sub
Panamax 5510 ACRegenerator