It turns out that maintaining a MM-styled stat block is a huge pain in the ass. I finally finished the spreadsheet version of my character sheet, which calculates everything relevant automatically. It even adjusts the power descriptions based on which tier he’s in.

I’ve attached both a PDF version of the sheet as well as the original
Numbers document just in case someone wants to play with it (and has access to iWork ’08). If you download the spreadsheet itself, you will need to change the extension back to ‘.zip’ because the forum would not let me upload it otherwise.
Edit: I changed some things around and fixed a few bugs in the character sheet. All stats and equipment are on one page, and all powers are on another.