I have a pretty nice stable of vehicles now and I am currently looking to trade my SUV (2001 Explorer). I decided that I'd take it and about $30,000 and see what I could get so I might not be at your $100k number, but I do have the problem. I settled on this: http://www.volvoxc90.com/home/ I am pleased with my self-imposed Christmas gift. I added the DVD/NAV system, and several package upgrades. I even opted for the foreign delivery plan so with the trip (for two) and the shopping that goes along with it, I just might make your number yet.
I would buy one of those electric/gas hybrid cars. And a Morris Mini Cooper. And one of those three wheeled motorcycles. A vehicle for every occasion. Like shoes. They would all fit on the back of my boat.
PORSCHE!! C4 or... Mercedes S500 Pros of a sportscar is the women... but drawback is you can only choose one Mercedes on the other hand has the best of both worlds... hmm. Yup, I'd still go with the porsche
What would I buy? Isn't it obvious? Speed Racer's Mach 5, of course, and yes, they will build you one www.speedracer.la Snake
I know, I know, it's only $695,000 more than the $100 K and won't be out for at least a year, but, at 1001 HP and a top speed of, say 250 MPH, it is so choice. I highly recommend it if you have the means.