Test-drive as many boxster's and z4's as you can. Push them to the limit on the twisties and see how they feel to you. IMHO, boxster handles better then the z4. tough to beat the mid-engine handling/agility of the boxster. lots of storage for a roadster, 2 trunks and some storage space inside. keep in mind you'll probably need new tires(not exactly cheap) every 1-2 yrs. on the boxster. Plus maintenance is potentially more expensive with the boxster. check out the message board at porsche pete's boxster board, PPBB.COM. mostly nice people with a passion for their cars. excellent site for boxster owners. I haven't kept up with prices but if you can afford it, look at 2003+ models. Starting in 2003, the boxsters got a rear-glass window vs. the vinyl/plastic one, and a slight boost in horsepower. have fun. good luck.