I currently run a Denon 2500 prologic reciever that has served me well for about 4 or 5 years. It does a good job with music(to my ears anyway) in stereo, driving 4 ohm main speakers to reasonable levels, but in prologic mode it is rather weak as it is only rated at 25 watts x 1 in the rear channel. I have been surfing the net for some time now to educate myself on the DD, DTS formats and equipment that are available. What I would like to know is would an upgrade to say a the Denon 2801 be a significant improvement over what I have now? I would love to go for the 3801 or even the next Denon model up, but the "trouble and strife" factor is kicking in and I may need to curb my ht desires (and budget)! Also, I do not run a sub at the moment and wondered whether adding a sub to my current system would "lift" it enough in the ht department to get me by for another few years? Your educated and knowledgable advice is appreciated.