after sorting out a problem with wiring, my Z car has been fan-freakin-tastic for daily driving, while unemployed most of the time, Highschool sucks. Can't wait for college though.
My advice, go test drive some Z cars that you like and see how they feel, some people have a good sense for cars and others don't it all depends on how the car feels, I test drove a 240z and it was unreliable feeling, change in idle, fluctuation in the electrics, some seals and doors werent really fitting right, little things can tell you alot about a car. Oh yeah, one more four letter word to worry about, RUST, check for rust, then check again.
As for people saying a certain car is generally unreliable, thats a common thing to hear ,but couldn't be more wrong. I had two Saab 900's that were known for being super reliable and safe, but I had THE MOST PITA moments of my life with those two, my Passat was very reliable, and so far the Z is very Reliable as well.