Bad news if you hate waiting ... Do you hate buyer's remorse less?
The Macbook Pro and Air lines are expected to have a major refresh in the April/May/June timeframe. New intel processors ("Ivy Bridge"), with a significant bump in processing and graphics power. Rumors are flying that the Macbook Pro line may lose the optical drive (like the air), the resolution may be much higher, etc. ...
See
Mac Buyer's Guide: Know When to Buy Your Mac, iPod or iPhone - "[Macbook Air]: Recommendation: Buy only if you need it - Approaching the end of a cycle". Macbook Pro guide is just above that on the page.
I need to upgrade my 7-year-old Powerbook G4 so I can run some intel-only software, including (soon) a version of OSX that isn't three cats old. But I'm holding on, this promises to be a significant hardware bump, and I don't want to feel cheated in a couple of months.
As for MacDive, I'm still using
DiveLog (MacDive is intel-only) but that seems to be orphanware at this point. I've been following Macdive and it seems well reviewed, as well as maybe the only reasonable choice, and I'll buy it when I can run it.