It will be quite some time before all the software you like to run is ported to the new architecture. This is a big mistake on Apple's part I think. I know they've done this before, but at least that time they were moving to a more powerful CPU. That isn't the case this time, as the advantage of the new architecture is much lower power consumption, not performance.There are very strong indications that Apple is going to be releasing new MacBooks and iMacs some time before the end of the year that'll be using their new processors. They'll be supporting the Intel chips for a long while, I assume, but I'm going to try to hold out until the next generation and then buy the fastest one I can afford with at least 16 GB of RAM.
It's worth looking at the iMacs if portability isn't all that important to you. Lots of bang for the buck, at least relative to other Apple products.