I went a completely different route; I built a Hackintosh: a generic PC that, with a few tweaks, can run OSX: The Always Up-to-Date Guide to Building a Hackintosh [OS X 10.8.2]
For less than $2500 I have:
- Asus P8Z77V-LX Motherboard
- i7 3770k running at 3.5GHz (that I could overclock)
- 32GB RAM
- GTX 650 ti 1GB video card that supports Cuda and Photoshop CS6 GPU acceleration
- 256 GB SSD boot drive
- 3TB hard drive
- DVD Writer
- Coolermaster case
- Dell U2711 27" 2560x1440 IPS, wide color gamut monitor
(If you haven't seen a wide gamut IPS monitor in action, it's a think of beauty, it makes ordinary LCDs look dull and color constrained.)
Sure, it takes some work to set up and configure, but it blows away the totally-tricked-out highest end iMacs in performance for about $2000 less.
A Hackintosh might no be everyone's ideal solution (it's not an out-of-the-box plug-n-play solution), but if you have even minor tech chops, it's a great value.
Oh yeah--it also triples boots: OS X (Mac), Windows 7 and Linux (Ubuntu 12.10).
Almost the same setup
However I used the Processor's video card, so I saved at the video card end
120GB SSD Boot
250GB SSD Temp Pic File
120GB SSD Cache for Photoshop
helps a bit scrolling through pictures in Lightroom...