If money is not a problem

Tidal T1 system - I guess that choice may be considered an acclamation for my present Contrivas - and I'd bring in Thomas Fast to treat the room.
http://www.tidal-audio.de/english/t1-specs.htm
Cables probably Argento Audio Serenity Master Reference or Virtual Dynamics Genesis or Stealth Dream + Dream Bass (I would have to audition all of these plus a few more, of course)

As a second system perhaps Black Forest "Helix To Heaven" + "Mammut C" for the kick of a full range system.
http://www.blackforestaudio.de/cms/front_content.php?idart=130

And to accompany watching the occasional movie a 7.0 Klipschorn system :^)

I just heard the Scaena loudspeakers with dCS Scarlotti, Nordost Odin cabling, and both VTL Siegfried and Wyred4Sound SX 250S. WOW! See Golden Ear Rewards in last issue of TAS.

unless the notion of near-limitless SPL's is the reason for the question, the answer for me is simple- the same speakers i already have. money is not the problem- it's the software- both variety and format- which is always changing, and not always for the better.
that for me is the limiting factor- after you've been in the hobby for awhile of course and have the opportunity to audition what you want, and then waiting and saving.
but for me, really good recordings by the most gifted artists of both classic as well as new music are the last pieces of the puzzle.

I'd hire some musicians! Live is better than recorded any day.

"Live is better than recorded any day ..."

True, but since money is no problem, I would install a recording studio to record the live sessions. Then I would use that recording to A/B .. C/D .. XYZ my Maggies, my MLs, and those funny looking sea-shell speakers that look like a Nautilus from that Brit company that everyone LOVES TO HATE ...

Then after my A/B sessions, I would decide to continue to book live musicians, because the staging and the dynamics aren't right with my speakers / amps.

Ah, life is good ...