Thanks for the responses, I really appreciate it.  Unfortunately 07-08 CT are a little more than I want to spend (expensive boat).  I could swing a 06 CT or possibly an 08 CS.  I'm not as much concerned about the power as I'm confident both the CS and CT will have enough since the 06 CS has about as much output as my truck does now and is as fast as my 3-series.  The tricky part is really finding an air suspension on a CS, I've done a ton of searching and they're really hard to come by, but it appears to me the air suspension was standard in the 06 CT, at least most of the ones I've seen have had it. 

My line of thinking with leaning towards an '06my was also that I'll keep it for 3-4 years and then upgrade to a 2010 for the new PCM when people start trading them in.