What would you buy

With what you just said, I would put half into a Swarm/distributed bass array. This will give you awesome unbeatable bass with any speakers you may use going forward. With the rest, and maybe a little more, the Raven Nighthawk https://www.ravenaudio.com/product/nighthawk-mk3-tube-amplifier/

This together will be almost exactly your $6k budget and a HUGE IMPROVEMENT across the board. Plus notice the Raven has not only a sub out but also a built-in crossover for extra flexibility.

If you build your DBA like I did then you can have either beautiful wood finish and two Dayton amps all for under $3k, OR you could have just as good quality bass with one Dayton amp and cheaper finish on the subs and keep the cost well under $2k. Either way this combo, the DBA and the Raven, will be darn near unbeatable for $6k.  https://systems.audiogon.com/systems/8367

I'm a PrimaLuna man. I had to get over my aversion to Chinese made gear and all is good now. The build quality is outstanding, looks not offensive to me and I really enjoy the way you can roll tubes painlessly. It's a lot of fun and I've owned many tube rigs over the last several decades. BTW, the sound quality is outstanding. I don't know your speakers and their power requirements. Good luck, stay safe and have fun.

I heard good things about Prima luna. As a matter of fact, I made my decision to buy the Rogue over the PL bc the Rogue gave me more watts90 vs the PL 30. Im a little concern that tube amps dont put a lot of WPC vs SS amps. Maybe there is a better way to evaluate tube amps.

Millercarbon suggested the Raven. but just 30WPC!

30wpc is not enough to make the Vandersteens sing.  Call Johnny R @ Audio Connections.  The Belles Aria integrated drove the Vandersteens with real authority when I was at his shop last year.  Johnny will be able to match your speakers to the amp which sounds the best within your budget.  He will NOT sell you something you don't need or that doesn't sound good.

friend of mine is recommending the Mc Gary SA 1 tube amp at 30 wpc.  Some reviews say the put a lot more power and can drive a lot of speakers. but 30 is still 30.....