Baron,
The STi can't compare to the C43 in terms of luxury. I have a SLK320 also and I would jump into it a few times a week just to listen to the radio and CD! Also, the ride quality is much worse in the STi.
But if you want a ride then go to the Union City KK meet this Tuesday night. I should be there around 8 PM. I can give you a ride if you like. I have a white/silver STi with a WRX wing. PM me if your going.
Will