You're right about trendy colors, they will really date a car in short order.

A recent color that I think is a good alternative to black is a 2005 Mustang color called Sonic Blue, it's not available on 2006, '05 only. It's a nice, rich blue, with a tendency toward red on the spectrum without looking purple. A friend sent me a picture a while back of a '56 F100 done in this color with a traditional flame job on it and it was a major knock out. Unfortunately I didn't keep the pic to show you. Another dark blue that looks nice and rich is on the Chrysler 300, it's not a pearl or metallic, but looks very sharp with some polished accents from wheels, etc. I've seen it on base model 300's and it doesn't look as good without the counter of the polished aluminum.