I finally get to post my own. I've been looking at all of yours for weeks, going insane waiting for a new iMac to show up. It turns out that I found a slightly used, fully upgraded 27" iMac for the right price. I tried it with two 24" monitors for a while, but didn't like the resolution differences, so picked up a refurb 27" Thunderbolt display. Here's the result:
My Dream Machine
Specs:
27" iMac 3.4ghz I7 with 16gb RAM, 256gb SSD, 2 TB internal (bootcamp)
27" Thunderbolt Display
Promise Pegasus R6 12TB Thunderbolt RAID 5 (my data drive)
Mediasonic Proraid HFR2-SU3S2FW 12TB FW800 RAID 5 (for Time Machine)
NewerTechnology Voyager HD dock (USB)
CyberPower 1500PFCLCD (sinewave) UPS
ScanSnap S1500M scanner
D-Link 8 port powered USB hub
Pioneer external blu-ray writer
Logitech Z5500 speakers (digital optical connection)
The one thing I am a bit disappointed with is that the cables for the Mediasonic are too short to run around the back, so I had to come over the front with them. Alternatively, I guess I could place the whole unit behind the display, but I kinda (for now) like it up where I can see all the flashing lights and know what's going on. It's only Firewire 800, which isn't in the same universe as the Thunderbolt Pegasus unit, but it works good for Time Machine.