Thanks guys for all the responses so far. Bruce, you're right that I have no idea what I'm going to do. Just day-dreaming at work today and thinking about "possibilities".
One thing for sure is that I'm not going to change any cars until 2009-2010 at the earliest. There is no way I'm going to get rid of the C55 so soon, as the largest depreciation occurs within the first 3 years. And I'm loving it too much anyways. But as cars age beyond 4-5 years, that is when maintenance costs go up, and I'm sure Mercedes AMG parts are not cheap. If I look at it that way, I should trade the C55 in for the M3 sedan in 2009-2010, end of story. It's just this little voice telling me how much I would love to keep the C55 for a LONG time that is causing all this trouble.....
2009-2010 will be prime time for the M3 sedan, probably a year after it is formally introduced.
Cars like the Ariel Atom and Caterham are not available in Canada. The Lotus Elise is available, but it is not "cheap" either.