I'd recommend the Don Sachs offerings that are popular here on this forum. Both use 6SN7s as driver tubes, which is IMO one of the very best sounding tubes out there:http://www.dsachsconsulting.com/custom%20line%20stage.htmland http://www.dsachsconsulting.com/custom%20kt88%20tube%20amp.html
You can adjust the sound of the ST-100 by changing out the 12AX7'a and 12AU7's also with the preamp so if this amp fits your needs and price range go for it and put a "lusher" sounding preamp in front of it.
Depends on if you are planning to buy the ST-100 new or used and how much you would have left over if $7000 is your limit.
I demoed a TRL Dude in my system with the Salk HT2-TL speakers (RAAL tweeter) and found the sound too smoooooth for my taste. The pre-amps owner ended up selling the Dude to try out something with more energy. An excellent pre-amp but definitely system dependent so without knowing your speakers the pre-amp and amp recommendations will be all over the map.
Lush/tube-y sound or more neutral, tho?
Buy used gear cheap or estate sale. find some excellent mcintosh amps at estate sales for peanuts. Allnic is excellent quality and cheap used.