I am new to the world of home theater. I am building my first room. It will include a projector screen (around 10 feet) and a 7.1 sound system all run off my HTPC (home theater personal computer). I have a Polk Audio RM6600 5.1 set of speakers that i plan on adding to. I like the Rti10 's for the front 2 channels, the rm6600 will fill out the surrounds and surround backs. I dont need much more than that. The room is 14' by 14' with the back open. My sub cant keep up (polk psw350). I need advice on 2 things 1) please recommend a good sub for this room. I will spend up to $700 cdn dollars. I like the PSW505, but i am open to suggestions. And 2) I need a good 7.1 reciever/amp. I dont know much about these, so any suggestions are welcome. I am no audiophile, but i would like a good reciever for the buck. looking at around 1000ish cnd. Any input would be very welcome and much appreciated!!!