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