Dumprat,
Its interesting that you brought this up. Recently i changed vehicles and caught a lot of flack for it from some co-workers and friends. Previously i had a 2001 mitsubishi montero sport,it had rear ome coils, 265/75/16's, an ARB, skids etc...and was well prepped for moderate wheeling and week long adventures. I sold a rig that i was essentially 'done' and 'happy' with, to pick up another vehicle that was the same basic platform; japanese 4wd, 4 door, mid size suv, a 1997 toyota 4runner.
While there were many reasons behind this move, one huge one for me was parts availability. Even before i purchased my montero, i did some research into parts availability, and some polling of mitsu owners. All reports came back positive, most parts stores had the basic stuff, and the online stores mirrored that. After owning the vehicle for some time and having a need for some less than everyday parts, like ring gear bolts, carrier bearings, axle seals, pinion bearings, idler pulley etc. I became a little frustrated, at the time, VERY frustrated, when learning that the only place that had all my ring gear bolts was in NJ (i live in Northern CA) or when the only people that had the idler pulley i needed was a mitsu dealer, in Los Angeles.
These situations, those probably not common really bothered me. I work with limited parts availability on a daily basis, I have VERY little tolerance for it after a few years in military aviation.
I'm not saying that people lied to me, that wasn't the case at all. I probably didn't fully factor in my location. Though i am in the lower 48, in one of the largest states I am in a somewhat isolated location, with no mitsu dealer and not a lot of mitsu's locally, naturally a parts store isn't going to stock parts that it doesn't always sell. With my 4runner, parts availability is MUCH better.
Now, i don't particularly enjoy having a vehicle that everyone else has, or has built. In my location, toyota's have such a following its almost like a disease, with most owners feeling that their trucks are made of gold, while every other manufacturer is vastly inferior in every way shape or form. But what i do enjoy is knowing that in my local area, and where i plan on using my truck, i can enjoy good aftermarket support and a good parts network.
Cliff notes that i will use for vehicle selection:
Get to know your vehicle, its quirks, common failures, special tools, etc. Be prepared for common and odd ball breakdowns as much as reasonably possible.
Parts availability in my home town and where i plan on traveling, both common and obscure items, new and used.
Aftermarket parts, im a DIY'er, but some things are just nice to buy.
Popular vehicle=popular parts.
YMMV
Mike