Good choice of Receiver and Speakers. You will be amazed by the Orbs - recently helped a friend install them - we did Mod 2 for the center and 4 Mod 1s (90/10 movie/music). Once calibrated properly with a decent sub, the ORBs SING!!!!
For the sub, could also look here: http://www.av123.com/products_product.php?section=subwoofers&product=12.1
I read a lot about both the Onix X-Sub and the Outlaw LFM-2 - finally settled on the X-Sub recently.
Main reason - similar spec and reviews - X-sub is $100 cheaper. The only problem would be availability. I lucked out - called tAV123 and they had a B-stock unit for $179 (no 30 day trial on that). Love the sub, but am sure that LFM-2 is equally good.
BSMNT HT - Oppo DV-970HD,Tos HD-A2,Emo LMC-1/Onkyo TX-SR705, Outlaw 7125,PSB Image 4T 8C 10S, Outlaw LFM-1+,Panny PT-AE900U, DIY 106" fixed screen
LIVRM 2ch - Philips 963SA,Lexicon DC-1,Carver AV-505,Von Schweikert VR-2,Sony KDF-E42A10