I thought u get Aperture inlucded when u buy a mac. Or does that only count for Macbooks?
you get iPhoto when you buy a Mac, which is a stripped down version of Aperture.
The problem with Aperture is that Apple do not really seem to be supporting it or developing it.
V4 of Lightroom is rapidly heading to 1 year old - and not even a single rumour about Aperture.
I know plenty who swear by Aperture - but hear the same message, "if Apple don't do something soon i'm gonna have to deal with Lightroom".
Back to the OP question - why wouldn't you take the CS6?
To me, once you get a proper Mac set up, you'll rarely work with MS Windows when processing images, and as it's the same price - might as well have the latest...