I’m no Nostradamus, but if you want a classic BMW in which to shove your hard earned cash, stay away from the over hyped M cars like the E30 and head over to the shark tank. Find this 1985 BMW 635CSi offered for $7,500 in Nevada City, CA via craigslist.
The E24 generation BMW 6-series has to be one of the best bets for future appreciation (or at least lack of future depreciation) in the world of classic German coupes. These things look great, are actually fast (3.5 liter inline-6 puts out 215 horsepower in the later variants) and drive like a modern car.
If you find a better fullsize German coupe for a reasonable price, you should probably just go ahead and buy it. email@example.com