Hello everyone!

Current equipment:
CD: Cambridge Audio 751BD
Amp: Denon AVR-3801
Speakers: Quad 21L2

I am planning on upgrading my amplifier, hopeful for a bit more bass control and smoother treble.
Current choice between Marantz PM8005 and PM-14S1.
I was considering Icon Audio ST40 but not sure valves are a good idea as they need TLC. The Marantz amps also have several useful features.
With my current speakers, is it worth 2.5 times the cost for the PM-14S1?