335i vs 330i vs 328i

Hey guys, so I have finally decided to buy a car after years of saving. I currently have $12000 and I am looking for one of these cars. Im in high school and I have a stable source of income since I am a tutor at a college and I am a referee for lacrosse. I could easily make $200 a week just as a referee and about $1500 a semester as a tutor. So this means that I can definitely handle the high costs of owning one of these beasts. I was wondering if it is a good idea to purchase a BMW with 80K+ miles on it since that is the lowest I could find. And I was wondering if I should shy away from rebuilt titles. Say a rebuilt title was a rebuilt because of theft would it still be possible to buy it or no. And would the price for insurance rise with it being a rebuilt title?I can also post a few listings on craigslist to show you what the typical 3 series is like in my area. I'm fairly familiar with the 335i and the most common things to go wrong with it like the water pump or the thermostat but I was wondering if the 330i or 328i have these problems since I am not familiar with them. Also, would it be a bad idea to do power modifications to a BMW with high miles? I am planning on doing exterior mods (functional ones, I am not a ricer) but I am not sure if it would be a good idea to go for power modifications. I am planning on driving the car during college as well so which one is the most reliable? Also would it be as easy to get power out the 328i and 330i as the 335i and would it be possible to ever go above 350hp in the 328 and 330? And how much are the cars around you guys? IM going to need a car since I am in dual enrollment and my classes end at 12 everyday so if I am going to be driving anything it might as well be something I love and can say is truly mine. Let me know what you guys think! BTW most of the BMW's with 80-120k miles down in South Florida are around 10-16k. No mods whatsoever. So would it be a better option to buy a somewhat newer one with a down payment on it and pay it off monthly? Of course the car would be under my parents name, but I could still drive it and give my parents the money every moth to pay for it.