Well I'm still building mine (still beginning to understand concepts). But so far, here's what's on my list (hardware only):
Sequencer:
Elektron Octatrack or Apple Logic X (can't decide between H/W or Software). Time will tell.
Monitoring
Adam A7X Monitors,
Mackie 1604VLZ4 mixer (not enough channels...)
Apollo Quad (Not sure about this one yet, may switch to Motu 16A+Duo/Quad Satellite).
Synths:
Virus TI2 Rack (in a Virus TI1 body).
Nord Lead 4R
Roland Integra 7
Elektron Analog Keys
Roland V-Synth Ver2
Waldorf Blofeld (Broken Knob, in for warranty repair)
Arturia Minibrute
Korm EMX1 (this thing is awesome!)
Speak and Spell (still waiting to be Circuit Broken)
Volcas (these are OK, may get rid of them, would like a proper TB clone)
Effects:
Eventide Orville
Kurzweil KSP8
Ensoniq DP4