Moving to Tube Separates or Tube Integrated + Phono

 One thing I forgot to mention..Pay VERY close attention to HOW THE POWER TUBES ARE BIASED after replacement..Some amps require you to flip it upside down,open the bottom,exposing everything inside,locating the biasing pots & test points,POWERING UP THE AMP(VERY DANGEROUS) & trying to bias the amp while maintaining the test leads to their test points..This is a MAJOR PITA & IMO,a HIGHLY dangerous way to do things..

Wow!  That is very good general advice from Freediver.  I am also a big fan of EL 84 amps of modest power output.  That tube can be utilized in pretty modest amps to great result.  For the same reason I like 6L6 amps and KT 66 amps.  Vintage amps can be extremely good and cheap, but, the problem is it takes experience and know how to get the best out of them; it is not that easy to be a rookie tubie.  If you have access to a shop that can give you help, that would be the way to go. 
 

Tube gears varies much more than do solid state amps.  Some tube amps are leaner sounding than most solid state amps—whether that is good or bad depends on your set up and taste.  You should try to hear as many examples as you can to get a better idea about what to get.  The other approach is the way most of use to slowly get where we want to be—trial and error with fun, but also painful, substitutions over many years.

I have an all tube system with the exception of my digital streamer, It started many years ago with Dynaco separates, then went to Sonic Frontiers, then Aesthetix, culminating now to all modern Conrad Johnson. I also have as a back up, a pair of the big Bryston 28B SST monoblock amps, but it's been a couple of years since I last rotated them into use. I thoroughly enjoy what tubes bring to my listening enjoyment, In my opinion, modern tube gear offers greater detail in the music than say an old Fisher, Dynaco, CJ, etc... There's nothing wrong with old gear, it's just warmer sounding and more rolled off in the high notes than what modern tube gear provides, Again IMO. One of my favorite things about tube gear is that you can tailor it to your liking by rolling tubes, vintage or new, at will. Over the years I've gained a large collection of my favorite vintage tubes from various Euro and domestic manufactures so I am not going all SS any time soon.

"how much of the tube goodness from the integrated comes through when playing vinyl? "

As mentioned earlier, another anecdotal experience- tube phono stage to complete the tube presentation to the speakers.

Your brand choices are solid. Not one will have all features, so research all of them.

The upper level integrated amps within the group will be closer to separates in performance. 

Used can get higher level for less with research.