Tube Integrated vs Tube Seperates

I was in your situation (same budget) and went with the PL EVO 300 and for the money, I personally think it’s a great value. Upgraded to KT-88s and NOS preamp tubes and it never looked back. 
Will I go to separates one day? Probably, but that leaves me something to look forward to. For now, a good integrated is better than average separates. 
 

For those who bash the made in China and potential service issues, I’m not sure where the logic is to that argument. These are well designed and well assembled and not sure why a non-Chinese worker would do such a superior job! And I have found Upscale Audio to be excellent with their service. 

The 'idea' of separates makes sense, except when it comes to well made integrated from high quality makers which surround us these many years.

IMO you can give up a lot: convenience of unified features, reduced cost, size/weight/heat/placement issues for an 'idea' that will yield no actual perceptible difference if it is a high quality maker.

Power supplies: everything comes from separate circuit first to my Furman's capacitors, then to unit's capacitors. Everything goes thru the tiny wire in the tiny fuse, so thin hard to see. Meters typically show .01 w all the way up to a few watts most of the time, an occasional needed spurt from ...

I just bought a nice (get ready for the formerly dreaded word) Receiver, a Yamaha CR-1040, what a beauty, beautifully made, not tubes but sounds terrific, what convenience for that system! 

Did you ask Prima what difference they think you will actually perceive?

btw, I LOVE my Cayin Tube Integrated, and if Prima quality is as good as Cayin, that's hard to do, they are wonderfully made and sounding (your tube type preference gets involved of course).

I've moved between integrated and separates a number of times throughout my 30+ years in this wonderful hobby.  At your price point there are many excellent options.  I owned a PrimaLuna HP and rolled power tubes up to KT 150.  I really enjoyed the sound quality until I committed to streaming at which time I wanted to play with preamps.  Anyway today I own separates and would suggest you strongly consider the same if for no other reason the flexibility they offer.  Just my 2 cents.

Might check Quicksilver ... get's good reviews here: