Upgrade my Yaqin MC-100b for $2,000 - should I or not?

Hi, 
I had the 100b, it re-introduced me to tube amps. I recapped it and swapped out the volume pot for a black beauty. I really liked it, but I was wondering what the next level would bring.

I since tried Jolida 502a, Cronus Magnum, Pimaluna Dialogue Premium integrated.
With the exception of the Jolida (which is a really good amp) I’ve only kept the Cronus and PL. 
They both are an improvement over the Yaqin, better soundstage width and depth, both respond more to tube rolling ( I can use more varieties of tubes in the PL), better resolution, and the lazy aspect of the remote ;) . 

That being said, The differences were noticeable, but not epiphany level.

If you’re happy with your room and sound enjoy! That’s what it’s all about. 

If if you’re curious, buy used. That way if you’re not happy you can always resell without being out of pocket too much, or in some cases actually making a few bucks.

Looking at your room I’d look at some room  treatments, DIY some an play around, it’s a hobby.

good luck 
mdr

Thanks to everyone for their responses.  To answer a few items that were brought up:  My Yaqin had several different variations of tubes rolled into it.  I am convinced that everyone's room is going to sound different, so what happened to work in my room may not work in someone else's room.
My Yaqin had Mullard NOS for the 12AX7's, Baldwin NOS for the 6SN7's and Electro Harmonix 6550's for power.  That gave me the best sound in my room with my speakers.  The Yaqin to me was a little bright and needed to be tamed a little bit.
Now, the most recent updated came as a Jolida JS-1000-RC happened to come available for me to test.  The tubes were all stock when I got it, and once I listened for a week or so...I started in on tube rolling this one as well...and I have to say the Jolida just takes the room to the next level...it was the same WOW factor that I got from going from my SS amp to my Yaqin tube...the Jolida took it another step.
All the things that you can read in the magazines happened better with the Jolida once I got the tubes replaced and broken in...soundstage, imaging, all that stuff...it just got a little better.  
I am loving the room so much with the Jolida in it right now...it's just wonderful.
I upgraded the tubes in the Jolida along the same path as the Yaqin, finally setting with Mullard NOS for the preamp section and Electro Harmonix for the power tubes.  The sound is so sweet.
Hope this helps anyone considering tubes on their Martin Logans.
-TooSlow

try kt90's for the power tubes.