Why do you prefer s/c? The R53 s/c motor makes less power and gets way worse MPG than the R56 turbo? Jessica's 09 MCS gets here in a month or so we can have a little comparison.
As for that list I'd take the E46 M3 if it had reasonable miles and wasn't beat. I'm pretty sure you can only get an early E46 for 25k or less.