Good luck with finding a manual CSL ;)
I don't understand the SMG bashing, I have driven a CSL and thought the SMG was great. I appreciate the shift ferocity is remapped slightly in that, but general functionality is the same. I also have a friend who owns a standard M3 SMG2 and he loves it. I'm currently looking for an e46 M3 and intend to get an SMG!
Boot floors are definitely a problem on the M3s, BMW will only carry out a goodwill repair on cars upto 10years old, after that the very large bill is your own.
You can afford to be fussy, the market for sellers is ****e at the moment.