Whhooff.
You are the first person I have ever, ever heard of who wants to switch to Logic for the user interface. You've also never used Logic, apparently.
"slick, in an OS X way", it is not. I haven't seen Logic 7 yet - and I'm sure that Apple is finally streamlining the interface - but everything prior is a monster. Necessarily so, mind you: The interface complexity follows from the fact that Logic can do just about anything that *can* be done.
Reason's interface is based on a hardware studio (what with 19" racks and so; it's actually very effective), and its approach is geared towards creation of slightly lame-sounding, loop-based music. It's very powerful for doing that, but if you're going to be doing any audio tracking, you're going to need a hard-disk recording platform such as Logic or Cubase or Digital Performer.
Friends of mine produce the basic tracks in Reason and run them into Logic via Rewire, where they add real instruments and vocals.
With the addition of a decent drum machine to Logic Pro 7, the possibilities have increased, but if you primarily wish to do loop-based electronic music and are content to work with virtual instruments via MIDI, Reason is probably your best solution.
IMNSHO.
-s*