Recommend me a tube integrated amplifier

Wow - had errands to run yesterday afternoon and came back to all these replies! 

Thanks for all the great suggestions - I'll be parsing thru these.

I get/understand that subs are a high level impedance load to an amp and 'should' not be an issue, but I specifically asked about that because of a comment I read about the Luxman SQ-N150 saying do NOT use speaker level runs.  

As for my interconnects and speaker cables, I've run thru the gamut of MIT, AQ, Kimber, Analysis, etc.  And I currently settled on good synergy with AQ Jaguars for interconnects and Kimber 8VS bi-wire for speaker runs.

The K's are set up in a medium sized family room off the walls by 6ft and 3ft from side walls and they throw a vg soundstage.  Paired with the Luxman, they are SO relaxed and open sounding with amazing clarity.  

So what am I looking for?  I really can't complain at all - just curious about 'different' and put my toe in the tube tub.  If it ain't my thing - no biggy - I'll just flip it back to the pool for someone else. Maybe it'll be magic - won't know until I give it a whirl.

I believe a leben CS300X is right up your alley and man does it sound great.

I can also heartfully recommend an air tight ATM1 used. Both the amps can be had in your budget and sound glorious. The only downside is that they don't have preout for subs. But I have tried the speakers level connection to my Zu Subs and it worked great 

I highly recommend @aricaudio   https://aricaudio.com/tube-gear/
Aric worked with me via phone calls and 50 plus emails to help me select some tube amps.

i now switch between his 300b PSET and a Luxman M10X using his Motherload XL tube preamp. 
‘I have 92.5 db sensitive speakers at the moment.

At the very least give him a call because he will give you some professional advice.

If you are looking for a 300b based amp, check out Feliks Audio.  Brilliant for the price....have enjoyed it greatly with Devore 0/96's.  Full disclosure.....I have one for sale on Agon.  Good luck.

One approach would be to keep your Luxman as the power amp and add a tube pre-amp, like the PrimaLuna EVO 400.

This way you don’t have to worry about driving your speakers yet you have the “tube sound,” which can vary widely but you can have a lot of fun with tube rolling to get the sound you like.

You also don’t have to worry about replacing power tubes nor doing periodic biasing of those tubes.

Finally, if it turns out the tube sound is not what you hope it would be, you can easily revert back to using your Luxman as an integrated amp again.