Upload & Sell: Off
I use an NEC P221-W and a Dell 2005FPW. The NEC is calibrated with SV, the Dell uses an old profile generated by Spydervision which I imported from my XP system. Given that I use the Dell primarily for Photoshop palettes and the LR editing screen (LR full screen display goes on the NEC), the two are color balanced plenty close enough (see below). The neutrals are spot on, the Dell's colors have a bit more red than the NEC (although converting to sRGB for this thread changed things just a bit).
It would seem you have an issue, but whether it's hardware or software I'm not smart enough to know. I don't know jack about Macs, but I assume you have the correct profile assignments for your monitors at the OS level?
Here's the image I used for my screen capture: