I have a z3 and a boxster and hands down the Box is by far my favorite!
The Z3 is unbelievable reliable as I've owned two of them and the only problems with it are stupid little things like the door pull coming off now and then or the gas guage bouncing around on occasion. It is a fun car to drive, but no comparison to the Z3.
I test drove the Z4 a number of times. Once all day test drive. The 3.0 S is the way to go if your gonna drive a Z4. The 2.5 is peppy (I guess) but the 3.0 S is easily as fun to drive as the Box. However, I chose the Box, b/c they are about equal in driving experience and the porsche is just simply better looking...bottom line!
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