I'm fond of Torchwood. And you would like SPN gen, but if/since you read like I do (only with incest and RPS squicks *g*), I know a gen-only fandom doesn't really appeal to you. But yeah, I got nothing. I love Heroes, but not for the fic, and ... yeah. I think Torchwood, in terms of prolificness and themes and stuff, is probably your best bet for a Shiny New Fandom.

You will like this: http://xwingace.livejournal.com/58308.html which explains what happened to make Jack lose a few years fo memories and should hit your time travel kinks (gen), and melina123's delicious is a great resource for recs.