What piece(s) of equipment would you most like to try?

If you had the opportunity to demo any equipment out there what would you try? I have several in mind but here is my initial list...

darTZeel NHB-18NS amp
Burmester 911 MK III amp (ok and since we're going for gusto the 909 also)
Ayre MX-R mono block amp
Vienna Acoustics "The Music" speakers
Sonus Faber "Stradivari" speakers
Legacy Audio "Aries" speakers
Atma-Sphere MA-1 mono block amp
ARC Reference 250 SE mono block amp
Source: Meridian MQA player
Amps: Handmade e.g. D'agostino or Jadis
Speakers: Vandersteen Quatro CT, Proac Pro Carbon 8, Dali Epicon 8, JBL K2 S9900 or Everest DD67000
Preamp: ARC REF 6 or 5SE
Wire: Graphene doped OCC copper  
Being most a low-powered tube fan, I would like to try something completely different, such as the YG Acoustics Sonya speakers with Bridge Audio Labs amplifiers and linestage.  For phono, the Lyra Connoisseur phonostage.  Now, how do I get the $500,000 or so to make this possible. . .
After hearing lots of talk about Tidal speakers I would love to try the Piano Diacera's in my system.