1st Post - Semi Vintage vs. New

Hello Agon Community,
I have an Adcom GFP555 II into a GFA545 II...I think they sound pretty good with my system. There are lots of things I can upgrade but I have a good set of speakers. I know I could use a better DAC but my question is if I buy something like a Marantz SR7007 or maybe Emotiva separates, will it sound better than my old 2-channel amp/preamp, everything else being equal.

And just to complicate things...what if I have the old equipment gone through? Change the answer at all?

Motivation: thinking about using my good speakers in the room with the TV until my listening room is ready and do NOT like the sound of my pioneer receiver. (Or conversely, may use the new receiver in my listening room...little office...until I upgrade to a better 2 channel amp)

I kinda thought that technology would have caught up such that a new receiver would sound at least as good as a 20+ year old preamp/amp but the sound quality of the Adcoms are so superior to the pioneer that now I'm afraid to buy something for the obvious compromises. What I'm looking at, though, are 3 times or more the cost of the pioneer so I'm wondering if that will get me into better sonic territory.

For reference
JRiver Media Center 18
Music Streamer +
Zu Oxyfuel interconnects
Oppo SACD (can't remember the number but it's the last non bd unit) (use only as 2 channel)
Adcom as mentioned above
Zu Omen Defs w/Soul Superfly drivers