Get the Z4's close cousin. An E46 M3. Still affordable, relatively reliable, relatively inexpensive to maintain. ("Relative" meaning when compared with other BMW M cars.)
EDIT: If you're not hung up on getting an M, there are some nice, less expensive options. Look at cars with the N52 motor such as the 328i and 128i. It's a great, reliable motor, and it is extremely light, which makes for excellent handling characteristics. Plus it can be jazzed up with a 3-stage intake (if not already equipped with one), which adds 30HP. How often can you do that on a normally aspirated engine?
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