I think this is a great topic since it is so subjective - based largely on ones influences during the formative years. I often dream of having the ability to afford/keep a 2nd car that may at some point appreciate in value. I think if one were an "investor" we'd be talking about all the cars that posters get made of; e.g. Testarossa, Countach, 959, etc.
From a GRM perspective, we want to keep the costs more reasonable and not be afraid to enjoy an autox with your "investment". Here's my list, any feedback:
1970-73 Camaro
1978-81 Pontiac Firebird Trans-Am
1987-91 BMW M3
1988-95 Corvette ZR1
1990-97 Mazda Miata M or 199_ Miata R
1993 Mustang Cobra or Cobra R
Any Porsche 911
1996 Corvette Grand Sport
1999-present Corvette Z06
2002-07 BMW M3
2004-05 Subaru WRX STi
200_-09 BMW Z4 M Coupe
Now those are some cars to lust after. I mean if you are going to dream, even a realistic dream, then at least make them more interesting then some of the other cars listed in this thread. I would add in the 944 and the NB Miata to your list.
"Saab" Saab's, not GM saabs.
Anything AWD that is sporty and not a Impreza. (try to even find a 323)
Turbo Dodge vans. I want one now.
CTS
1st gen Vipers (think they already are)
WORKING 4-6-8 caddys (dad had a beater one, with a working 4-6-8, maybe 90-100K miles, got offered 5 grand for it!)
Mid-90's Toronado. I want one now. I'll take it in dark blue.
Escorts.
Sentra- from before the last update, so around '06. My girl has one, every time im in it i think to myself "wow, this car handles nice" and then I ask to rallycross it, and she shoots me down... 
How could i forget? "Flying Brick" Volvos!
Late model E30's
Especially the 318is and '91 325i
kingbeann wrote:
1970-73 Camaro
1978-81 Pontiac Firebird Trans-Am
This is already happening. A really nice 1979 Trans Am just sold at Barrett Jackson's Palm Beach auction for $43700(!)
and my neighbor just got $5500 for his billion-times-painted/rolling bondo sculpture of a 1971 Camaro on eBay.
...must ...resist...the urge....to...FLAME!!!!!
