With your budget, you can create a killer system. Salks make a great foundation to build upon. In lieu of a regenerator, the dedicated line is a great choice and relatively inexpensive. Unless space is limited, get a separate amp, preamp and DAC if you want to maximize sound quality. For $8K remaining, I'd budget as follows for used gear:
$1,500 - amp
$1,500 - preamp
$1,000 - DAC
$2,000 - cables
$1,000 - power
$1,000 - room treatments
For an integrated option:
$3,000 - integrated tube amp
$1,500 - DAC
$1,500 - cables
$1,000 - power
$1,000 - room treatments
Once the system is built, save up for some dual subs and you'll be done.
Oh, one more thing -- forget about the specs -- those Salks will likely sound better with more power. My speakers are 98 dB and I use 350wpc monoblocks.