OK, I've got a Denon 3801 amp, same as the 3802 without the Prologic 2 and I have the KEF hometheater set of speakers 7 in total for 6.1 DTS. I was thinking of upgrading to a THX Ultra spec amp, but its a big step. You got to get a amp, speakers and subwoofer. Whats the best way to do this? New amp then get the speakers two at a time or would my Amp not produce a good sound out of these bigger speakers. On the other hand if I upgrade the amp then I have to be careful with the volume and my kefs.... ahhgg this is complicated. Another question I have is that you have one piece THX Ultra amps like the Demon A1 (or N1 or what ever) but there are other ways of getting THX. You can buy preamp and then poweramps. Is this good? Another factor is if I get a THX dvd player should I output optical or through analog interconnectors? Whats the best options?