Welcome to the boards bud. You sound to be level headed and the way you type is a very welcome surprise from what I would expect from our younger members.

to you sir.
Skip the ATX cars IMHO, not only are they less fun to drive but they'll be more expensive to maintain.
I personally don't like the Gen III cars due to their styling and being ATX only, so I would recommend a Gen I or II. There's really not much difference between the 2 so just go with whichever body style that tickles your fancy, tho you might find a newer Gen II car that is in better shape easier than you might a gen I.
Also don't automatically assume that a car belonging to a forum member will be maintained properly, always check out the car and find as much info about it's history as possible before getting it. Patience is most definitely key here, a nice one will find you if you're not in a rush.
With you being so close to NESHO, definitely have Kirk check out the car that interest you. Spending a little here might save you quite a bit later.
Stick around, these boards are generally very friendly and helpful. Don't be scared to ask more questions, there are no stupid ones.
Good luck!