I am looking to buy a E30 M3, but want to make the best decision possible. As it is now, I've owned and maintained old Volvos for several years and can pick out bad ones from good ones easily. Thus if I decided to get another (heaven forbid), I'm confident I could find the right one.
I'm hoping to gain this same knowledge about E30s before buying one. I've been following this board for some time now but was also looking for a book or something else. I saw a book called "The Gold Portfolio" (or something like that) focusing on all the M cars through the years. Is this any good? What else should I read to learn more? If you were looking to buy another, what would you do differently this time?