Emotiva UPA-7 question

Hi,all. I am posting in analog because that is where I want the biggest improvement, but I am asking about a multi-channel amp because my system currently has to function as both home theater and audio. Here goes: I am trying to get the best of both stereo and home theater out of my system, but am not sure where I'll get the most improvement. I have a Denon 3808ci receiver which is very nice, but probably is the weak link.(?) I use 7.1 channels of Axiom Audio speakers (M80s front channels, side/rear QS-8s, and M22ti's for rear channels 6 and 7, and EP500v2 subwoofer. I listen to hi-rez (SACD/DVD-A) rock pop and jazz and enjoy vinyl on a Rega turntable with Shelter 501 cart, Jolida phono pre-amp, and counter weight and vta mods. I listen to both stereo and multichannel hi-rez sources. But, I still do not think my vinyl listening is as good as it could be. The Denon has lots of power and is a solid receiver, but maybe I should be using a pre/pro setup - I don't know. Could you please advise whether getting the Emotiva UPA-7 would make any difference in the sound quality of my system or should I first focus on changing out the denon? The home theater stuff is just fine and the amps in the denon are fine for that, but I would like my cart to reveal more of the vinyl information and my hi-rez music to sound much better than regular cds. Thanks in advance for any help here. I am really just trying to make a plan so I can purchase as wisely as possible and don't want to buy an amp or amps if the bottom line is that the Denon will not allow my music to come through. I have enjoyed this denon and find it superior to my previous yamaha setups, but as everyone does, I just want to get all I can from my vinyl and hi-rez sources. Thanks for any and all opinions and experiences!
Laura