Well, if you're looking to go plug and play, then my suggestion isn't all that great. Just so you know, though, that GT620M in the Zenbook is one hell of a laptop GPU. It's a true next generation graphics card based on Kepler, and absolutely smokes the GT610M in the one you linked.
However, you get full voltage CPU's in the one you linked, so there's that.
That website carries customizable versions of the current ASUS Zenbooks (all the UX31E models), so I think it's safe to say that when the UX32VD releases, they'll be able to customize it for you if that's the way you want to go. I'd wait until the UX32VD releases and have them customize it for you.
You'll notice that you can't add a different SSD to the current UX31E models, but that's because they're a proprietary form factor. The UX32VD has a standard sized hard drive that's a bit slimmer than most. All the Intel SSD's will fit in it.
And I hate to be this way, but for the price you're looking at, it's almost time to the bite the bullet and dual boot a new Macbook Pro... And if you need more space, get a hard drive in an external enclosure.