My first car was a 1982 Nissan/Datsun (they hadn't sorted out the badging yet) Sentra station wagon, affectionately named "Sh*thead." In that car, I learned that a coathanger could be turned into an engine mount in a pinch. A clogged fuel filter would stall the motor, but it could be cleaned by blowing in it. And oh the tire changes. . .
Skappy7, kudos on investing and making $800. It's not much, but everyone starts somewhere. The difference between $800 and $8k is just scale. Keep it up.
As for cars, I think you're getting a little far ahead of yourself. The Elise is a fantastic car. I'd never recommend it as one's first and/or only car. It's a harsh ride. It's completely impractical. Fixing something as simple as a busted front headlight requires the removal of the front tire. The reasons could go on. Many of us on this board either have 1) years of experience working on cars, 2) money to farm out the work, or 3) both.
Elise ownership is cheap when everything is going right; it gets very expensive very quickly. Example, last week, my scooter fell onto the front clam. Oops, there's $500 after I strip the Starshield. In total, it's probably a $800 job if I install the Starshield myself, $1k if not. If you had an MR2, what would happen? I'd pick up the scooter off the MR2's polyurethane bumper, buff lightly, and be as good as new. In about 3k miles, the OEM Yoko tires will start to show steel belting. Time for new tires. Should I go for OEM tires? That'll be a good $1.1k. Maybe I should go for aftermarket? Still another $800, and then I need to get them installed. If I had an MR2, probably $500 installed at my local Costco.
Were I you, I'd step back from the cars you've selected and consider what it is that you really want. Chicks? The MR2 will be just as cool, with half the cost. Feeling like you've "made it?" Get the Z4. Want to learn to work on cars? Saabs come with tears. Feel like you're undeserving and want to punish yourself? Look no further than any Mitsubishi. Want to get onto a track regularly? Lotus.
A few other thoughts. Your parents are ridiculously generous for 1) offering to pay half a car up to $10k. Don't abuse it. 2) Offering to pay half your insurance. Don't abuse it. 3) Offering to pay all your repairs. Don't abuse it. See a pattern here? Ever had someone who you helped out at school? Had that person keep needing help? And needing, and needing, and needing? Ever get disgusted with them? Same idea. Just because you're not paying for it, doesn't mean someone isn't. This lesson will really hit home when you start to pay taxes. . .btw, if memory serves, the government owns $400 of the $800 you made in short-term investment income tax. Welcome to our world!
Meanwhile, keep poking around this board. A lot of smart and knowledgeable folks here. You're on a good track!