[Drew Mazurek]

I'm in the same boat.

I am thinking one of two ways:

1. buy used Mac Pro and transfer everything over with no fuss (will take 10 min). For me, that would be big step up going from a single 2.8 from 2008 to a 6 or 12 core for example.

good- easy, fairly cheap. buys you a few years at least, depending on how bleeding edge you need to be.
bad- as guitardom stated, outdated already. You'll eventually need to make another change.

2. Mac Mini (wait for Apple to update first of course) with one of the TB chassis and all external peripherals.

good- clean, future proof (as much can be) upgrade.
bad- pain in the butt to do. for example, I need 2 ethernet ports, one for network and one for ICON, so I'll need a hub. Some speculate that OSX might eventually be opened up to run on any hardware which to me makes option 1 desirable to see how things shake out. Likely more expensive with all the extras needed.

That's all I can think of off the top of my head, will add more later maybe.