+1 on the auditions recommendations. $20K is nothing to sneeze at and you want to spend it wisely. Seek out a local high end dealer, if possible, and try to catch some audio shows if you can.
Take your time. Don't make the mistake of rushing into this as you'll spend more time stuck with something that doesn't sound right to your ears in your room, trying to reverse engineer a mistake that'll be nigh impossible to remedy as there's so many variables involved.
That, and you'll end up coming back to taking advice from a forum who know nothing of your room, taste and ears. We all mean well but nothing supplants your own experience as your tastes and ears will evolve the more you listen.
All the best,
Nonoise