Berning TF10 or TF12 is the way to go! The liquidity of the Berning complements the somewhat dry sound of the Treshold. Believe me, this combo is true magic.
This preamp is almost unknown to the outside market but it is indeed a super preamp comparing to preamps costing alot more. But the price is more that you quoted but they only sell direct for the company. The manufacture is BWS by Bruce Wenger the owner. They give you a 35 day money back if you don't like it. It is a four nos tube preamp using the very best parts. AlSo,check out the web page. www.BWS-tube.com
if you're looking for warm but detailed sound, open and smooth on top with superb bass control, musical midrange, totally silent background, excellent soundstage and pinpoint imaging, try the Bryston BP-25. You might not need to hassle with tubes at all, unless you enjoy that sort of thing.
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