I can't make any specific suggestions since I haven't kept up with car audio for a few years. I don't spend a lot of time in my car and, when I do, I don't need a system that goes to 11 - ie, something like the Bose or other "high-end" OEM system is just what I need.
In general, for a small car like the Z you don't need a lot of power. 30-50W for hi- and mid-ranges and 250-500W for the sub should be plenty.
All I can tell you about speaker selection is repeat "get what sounds good to you." The speakers (driver(s) + enclosure) will make the most difference in how the system sounds and everybody's ears are different. For most people, any of the popular brands (see recommendations on this site and check out a few car-audio related sites) should work well. If the drivers are demoed in an enclosure, make sure you get the same enclosure for the car.
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