I am replacing a Pioneer Elite VSX-45TX that compares favorably with the Denon 3805--same price point originally, many of the same options, etc. I used the AVR's amplification secetion and when I decided it wasn't good enough, I began to ask around what might make the biggest difference...
Basically, my answer was:
1) Use external amps for the biggest difference and use the AVR as a pre-pro (do this first)
2) After a while using the AVR as a pre-pro, audition separate pre-pros and see if there is a $1000-2000 difference.
I bought the Outlaw 990 for pre-pro and a Sherbourn 7/2100A for amplification, and I will most likely be keeping both.
I have read very good things about both the Emotiva and the 990, but I felt the majority of positive reviews were for the 990, so that's how I went.
--TDA