Tube Amps

appreciate your insites and input...
the price range of $1500-2000 would be for either used or new
currently i run a mac mc252 on a set of ushers x719 which are 8ohm and 88db. the room size is 12x12...
i am fascinated by looks mostly and cool factor...is that worth the maintainace and biasing issues...btw what is bias tuning? is that a gain adjustment and is it a L/R or something else..
my other fascination is with class A rated output amps...are they worth it?
sorry i am a novice but got a serious bug..
thanks

Boa2
thanks for the follow up
i love vintage jazz...coltrane, chestnut,sandoval,billy taylor and of course krall and recently cincotti
i do like classical music...but not much orchestral or opera. Mainly piano and vilolin
and of course i do rock every so often...floyd,eagles and ray vaughn,etc
that is the spectrum of music i enjoy
like i said these amps have an enourmous appeal to me on the visual basis..favorites Mcintosh 2000(i believe) and like the looks of BAT units. Also any tubes come in class A outputs?
many thanks for your help

couple more questions
why are some amps designed with multiple tubes shown perhaps 6 or 8 and why some may have just 2
the other question is about shanling? and Mcintosh 275?
many thanks in advance
alex