The most beautiful Integrated Tube amp?

Pathos Twin Towers for looks and sound and the Unison for looks (may also sound great but I have no personal experience)The ATM 300 is also very good looking in a more traditional way and has great sound.

The Pathos Twin and also the SET amps that are in the shape of and "X" or "cross" (take your pick), but I cannot remember the name of the manufacturer (very unusual though).

have to add the Graaf stuff, Italian style always is impressive.

I'll have to go along with the Manley Stingray. It is a nice sounding amp also, a bit weak in the power department compared to some of the other recommendations but damn sexy and was designed by Eve Anna Manley who looks pretty good herself. I think my Cary SlI 50 looks pretty good also, especially in the dark with the tubes glowing reflecting off the chrome chassis. Ah, the joys of listening and looking at any of these fine open chassis tube amps that everyone has recommended is something to experience. Once you settle on one of these beauties you will want to listen all the time and wonder how you put up with mundane metal box stuff you have always listened to.

I own the Manley Stringray. It looks great, it sounds great, (if your listening room is a stadium you are going to want more power). In addition Eva Manley has a no nonsense attitude towards quality and customer service. My Amp poped a fuse. I called they told me to check the fuses. Told me if it didn't work call back, they will give their Fed Ex number, and turn the amp quickly or replace it with a brand new unit.