Tough call. SET's can sound vastly more powerful than their power ratings, but I think 9 or 10 watts will leave you a little short on headroom. If you had floorstanding versions of the ST's ( 88 or 89 db), you might be able to sneak by. With that said, I'd strongly consider something like a Line Magnetic 508ia. The output tube is an 805, but it does use 300B's for drivers. $1K above your budget, but it's 48 SET watts per channel. No doubt that amp would drive about anything you'd bring into the room provided it had a tube friendly impedance curve.