Beginner here and looking for any recommendations. After endless reviews, we are considering purchasing the following equipment: Movie screen - 110" Elite Screen ER110WH1 Projector - Epson 5010e, also considering the 3010e "3" front left, right and center speakers of Definitive Technology RLS III "2" Ceiling speakers of DT RSS III "1" DT SC6000 subwoofer Receiver, leaning towards the Onkyo TX-NR818. Also considering the TX-NR1010 It's 7 channel, so could add a set of speakers if need be and provides135 watts per channel. Is this enough power fro the DT speakers? The room is 14' W by 19' L. Does it make a difference on amp if we opt for a 7 vs 5 channel? We would greatly appreciate any feedback. Thanks for your help.