Okay, I finally took the plunge.
My 2006 MacBook 1.83GHz Core Duo has been working semi-faithfully for over 4 years. It's had 3 replaced top cases (2 yellowing, 1 chipped off edges), 2 replaced hard drives, and 1 replaced screen. Now it's 2010 and time to move away from the cheap cracking plastic.
I decided to go with the 15" i7. While I love the 13" form factor, the Core2Duo was the deal breaker.
I ordered mine through Amazon. $2099 with no tax or shipping, plus $100 off from Amazon gift certificates I had, brought this down to $1999. This will easily last me for another 4 years, so I can justify the cost of $500/year.
Based on GeekBench, the new laptop should be around 170% faster than my Rev.A MB.

I'll find out on Monday! The wait is killing me...