...This isnt a plug for anyone, but there are performance drive days you can sign up for that host porsche and lotus...
There is a good driving school that uses Lotus cars in Pahrump, NV near Vegas:
Lotus Cars USA | Performance Driving School
I'm pretty much a noob, but from my experience, my 911 (996) seems a lot more predictable, especially near the limit. I find my Lotus (Elise) is much easier to upset/lose control, but I am still learning to drive it correctly (aren't we all?

) I have to say, I like driving the Lotus more at events since I feel like I am doing what it was made to do, and I am not as concerned about messing it up since it was cheaper than the 911.
Though the power to weight ratio of my Lotus is better than my 911, the 911 just feels a lot more powerful - I can't quite explain it. (not sure about the power to weight of the 240s vs a 997 GT3 though)
I consider myself a Porsche guy too - I recently read an article in MotorTrend about the 2010 GT3 - great review. If given the choice and I had the disposable income to buy one, I would over a used 240s anyday.