I have a nice 5.1 setup with an Aragon StageOne pre/pro. The unit is designed for 7.1, however I just use 5.1. The Aragon has THX Ultra-2 Cinema Mode, DTS-EX and DTS-Matrix. I have been thinking of advancing from 5.1 to 7.1. I have some speakers that I can use and I can use an old SAE receiver with Pre-outs that I can use as an amp. I know that there are not that many movies in 7.1, however the THX Ultra-2 Cinema Mode will create the rear surround channels even if none are present on the DVD. Does anybody have any thoughts on 7.1 that they would like to share?