OP - Congrats on your TT purchase.
I had the Resolution Mk4 and an Illustrious arm for a spell and they’re excellent.
Also, Mark and David are good to deal with if you need any support.
You’re on the mark thinking about a tube phono for the Resolution as I found mine to err towards detail retrieval and dynamics, perhaps at the expense of a little body in the mids and heft in the bottom end. Very minor quibble and I found it easily addressed by having tubes in the chain, and of course, the right choice of cartridge.
There’s an Allnic H1201 floating around for $1400 which is a good deal. I have one of those and it worked really well with the Resolution/Illustrious. I also ran a Manley Chinook with the Origin Live deck and that has even more warmth and body.
I think a used Chinook is in your price range..