...trade it for a CLK 55..? How long should I wait before I trade it in? I got 100% financing so I didnt put any money down on the one I'm in now but I want to trade it in for a 2007 CLK 55 AMG Coupe (used).
How can I go about doing this since it's so soon?

Why trade it in? keep both of them. Then wait for another month, get one more.

Do what you want, dude....sounds like your financial situation has dramatically improved in the past few months so if you get dinged a couple grand on the trade-in, who cares. The 2007 CLK55 is going to cost you upwards of $75k so you're talking about playing with real money now, not just barely squeezing into an entry-level C-Class with 100% financing.

Most sensible Mercedes owners (not rap video MBZ owners) would agree: keep your 2006 C240 and invest your "new money" elsewhere. Buy an investment property or stick it into a balanced portfolio of mutual funds (many are kicking ass this year).

Your're gonna take blood bath on the depreciation, son.

My suggestion - save up a few grand to help alleviate the depreciation, and apply that towards your D/P; otherwise your payments are going to go WAY WAY UP!

How can you go from a C240 to a CLK55. What made u choose the C class in the first place.

You can do it any time you want. You'll lose a lot of money, but since you WANT it, go ahead.