I've had my 240 for a few years now, but during our "off" times (when it decides not to cooperate/etc) I drive the z06, my Tacoma, and my roomie's SC300... I love the vette's stability and brakes, I love the truck's 25mpg with A/C and seating for 5, and I love the SC's leather, tint, A/C, and torque. Not to mention the GSXR1000 for all those nice afternoons in the canyons, runnin 10sec 1/4's, or doin wheelies...
None of 'em hold a candle to the enjoyment I get driving my car. It's just special to know that I've tooled on every goddamn part of that car. The suspension's tighter than the z06 and makes me want to try and outdrive it, the motor makes those beautiful noises and revs forever (believe it or not, the powerband on the z06 sucks... it's like 3500-6000, then you have to shift before 6500 or the rev limiter goes bananas), the seat holds me perfectly (interior in the other rides sucks, especially the z06), and every time I park somewhere someone tells me how cool the car is/etc. It's goddamn special.
Plus when you're not driving a 240 and you wave to a 240 guy, he immediately thinks you're gay/a cop/both/etc... it's just not the same
Edit: Sorry to shit on kid's parades, but anyone that's actually driven a stock s2000 will tell you how tired they get of having to rev it all the way to the moon to get any power out of it. If you ask me, it's dollar for dollar one of the WORST cars to drive stock. Get a 350z or a c4 vette.
Dollar for dollar, the best ride is a 2001-2004 GSXR1000 or Honda CBR929RR (if you're a newb). Both run 10s, are mechanically idiotproof, and cost less than $5000. Done, and done.