Man that is tough in my book. Driving the e9x around a track to its limit (my limit) is a lot of fun and both Porsches would be great.
My vote would be a Cayenne GTS if that is in your price range. In my opinion they look sooo much better but not sure if towing is the same for the GTS.
Either way, any three would be a win. Tough choice man, good luck.