Open Canvas-like program for mac?

Anyone know a good program like Open Canvas for mac OS X?  Doing graphic design work on my new MacBook, and I haven't found a really comprehensive art program yet.  Photoshop is OK, but really, I'd like something better for the job.  needs to do pressure sensing on a wacom tablet.

Tired of dual booting, though that is an awesome feature of the intel macs.

>>1
Corel Painter.  It's what the Wacom pressure-sensing was built for anyway.
>>6
It's position is undeserved because it kind of sucks.  For what you get, it's totally overpriced.  The two go hand-in-hand.