How much do you figure your tiburon is worth?
I wouldn't go for a 318. It's the base of the base and you will end up putting a lot of money into it making it go and look. 160k is good mileage but is also right around the time when all the bushings need replacing, or soon will. I'd much rather buy a mint maintained 328is/i with 250k.
1998 BMW 328is - summer
1994 BMW 325i - daily
1992 BMW 325i - gone
1988 Mercedes Benz 190E 2.3-8V - sold