i wouldn't go for a strict DH bike. as you said, there aren't a heck of a lot of places to do that sort of thing 'round where you live. bikes other than strict "DHers" can do DH riding - maybe not to the same extent.
Trails and DH, at least in my opinion, seem to be pretty distant disciplines. I don't think you can really get a bike that fits easily in between the two. lol, go for a SC Chameleon and a couple forks you can swap out, depending on the riding for that day.
But if push comes to shove, and things have to be black or white, i say go for the trials bike. more "versatile." Still, you have time to think 'bout it. figure out what you want to do.