I was just in the same boat as you are now in(sort of). My final decision was to hold out and save up. Like Todd said, you will be attending a university next year (hopefully) where you will recieve an education. With an education you can earn big bucks (hopefully) and then you can mod the hell out of your Z. But for now I would reccomend saving your money for maintenence and doing the 120k. Keep your proirities in order. If the speed bug really hits you, sell the Z and invest in a twin turbo. I see TT's with 100k miles and clean titles go for 9-11k all the time.