What are the main problems?

Im heavily leaning towards in buying a '94 325i. It has somewhere around 100-120k miles on it.

What im looking for in a car is just dependability; meaning the car wont break down or anything of the sort, and the engine running smoothly... hopefully for a VERY long time.

I understand however that > 100K is alot of mileage for any car. So im just wondering, when is the focal point when the 325's start having their problems?

And, what exactly are the problems that can occur for the 325's?

Will I have to shell loads of money to get the problem fixed too?

Thanks.