Help with first tube amp

A huge thank you to everyone that has taken the time to respond.  All of this is super helpful.  Seriously - thank you.  The audiophile community is the best.

So after reviewing all the comments it seems I ned to upgrade my speakers to get that true tube sound experience if I wanted to go straight tube integrated.  

If I found speakers in the 90 db sensitivity at 8 ohms - will that do or do I need to look for higher sensitivity?  Most of the amps I have bee looking at output 20-30 watts.  I have a medium size listening room and since I live in a condo in Brooklyn, I can't really crank the volume and need to listen at moderate levels.  

Lastly, for the tube amp owners out there. Do you prefer the 300B, KT88 or EL34 tube sound>. How would you describe the sound differences of each?

If I found speakers in the 90 db sensitivity at 8 ohms - will that do or do I need to look for higher sensitivity?  Most of the amps I have bee looking at output 20-30 watts.  I have a medium size listening room and since I live in a condo in Brooklyn, I can't really crank the volume and need to listen at moderate levels.  

Lastly, for the tube amp owners out there. Do you prefer the 300B, KT88 or EL34 tube sound>. How would you describe the sound differences of each?

@licarijo So much depends on design and execution that it really isn't very accurate to assign a 'sound' to any power tube. But it does seem to work out that of higher powered tube amps the EL34 is often cited as the best sounding power tube. My surmise is in your budget a 300b based amp that is actually worthwhile is outside the budget you mentioned. But if you were to compare to an EL34 or KT88 you'd want that 300b amp to be push-pull and not SET. 

SETs don't make much usable power (about 20-25% of full power; if you want the most musical presentation) so you'd need speakers much more efficient than just 90dB- more like 100dB is needed!

But 90dB and 8 Ohms would work fine with a PP amp of 35 Watts- like the Dynaco ST70. Dynaco makes/made a smaller amp called the ST35 that is more musical- hard to say if it would work in your situation but if you're not playing it that loud (IOW if it has enough power) that would be the better choice as the EL84 is an easier tube to drive and so can be lower distortion than the larger octal-based power tubes like the EL34. 

Well, it might be worth finding the amp you want and then just see if it works with your speakers in your situation.  Or, the Black Ice F22 and LSA VT150 are highly rated, are in your price range new and likely have enough power for your speakers so may be another option to consider.  I’d think they offer some kind of trial period, which would be a nice option to have.

https://blackiceaudio.com/integrated-amplifers-1/p/black-ice-fusion-f22v2-tubeintegrated

https://www.underwoodhifi.com/products/lsa-amplifiers

If you are new on tube amp get auto bias , and for you speakers Primaluna evo 100 will probably work.

Keep the Sonus Fabers, a *small* 90+dB speaker that will fit your space won’t come close to them.  Consider the Black Ice mentioned above, a venerable company (formerly Jolida) with excellent customer service.  Also, the Tubes4HiFi VTA ST-120, based on the classic Dynaco Mark III and updated driver board, excellent transformers!

http://www.tubes4hifi.com/amps.htm#ST120

I fell in love with 300Bs and ProAcs 30+ years ago at Audio Depot in Maryland.  Still have the ProAcs but gave up on SE as just not conveying enough information with so many wonderful new digital classical recordings.