I bought both the G4 450MHz and my 667 TiPB when they were the at the top of the performance list. It truly is amazing how little time it takes for them to be outdone. But I would say that for me it was the right decision, and I'll be doing it again when the NextGen Mac comes out.
Oh, and Shrek, what's with the bold red part of your sig - I appreciate the reference, but that's a little much.....
D