7.1 in a Family Room...is it worth it ?

[RickX]

Before I pose my question, here's my equipment list for my family room. None of it has been setup yet.

TV: Sony Bravia XBR 52" LCD
Receiver: Sony STR-DA3300ES
Speakers: KEF KHT3005SE + 2 Additional KEF HTS3001SE speakers (making it 7.1)
BD-Player: Sony PS3 40GB

The room is approx 14' x 15', has 3 walls, hence is not enclosed (like a dedicated home theatre room). My sofa is placed flush against the back wall of the room.

So my question is, is it worth installing the rear surround speakers at all ? It's recommended that these speakers are set up behind the listeners, but I don't have that option since the sofa is up against the wall already.

My plan is to set up the 5 satellite speakers at ear level. And then I had an idea of mounting the additional 2 satellites at ceiling level on the same wall as the left & right surround speakers. But I'm not sure it's worth the trouble (and wiring !)...

Any opinions would be greatly appreciated.

Thanks.