I've done it both ways (and owned a comic book store at one point), and assuming you've had these for years (meaning you're going to make some serious profit no matter which way you choose), I'd probably go with selling to a dealer; selling them yourself, even on eBay, is a lot more work than it looks like, and then at the end, you're stuck with the dogs anyway. The problem, of course, is your being away from the scene for so long and so not having any connections to find a dealer you can trust (because, as you probably suspect, some of them can't be). If you're in the Bay Area in California, I could steer you in the right direction, but elsewhere I can't help.