Well said wolf, I was a little surprised at Dave's use of the term incremental when comparing the performance of the 991S to the M3, although he later makes it clear that to him, it is not $35k or so of a difference.
I would also suggest to wait for the new Cayman S, it looks like it will make a great track car. Price wise, I have always felt that people that buy an M3 would be more inclined to cross shop a Cayman S since they are at a similar price point. That is unless you need more than two seats!
Former car: 2007 335i JB3