Nebulous
Legend
That place, for me, is occupied by Red Hand of Doom. But I'm eager to see what P1 is like. Didn't quite like H2 and H3.
Yeah, although i never ran it, RHoD looks like one of the top adventures (although my tippy top fave is probably Return to the Tomb of Horrors).
I liked H1 a lot, and i plan to run H2 and maybe H3. I received Trollhaunt yesterday, and after a cursory glance through it, yes, it does look very cool. It takes us a while to get through campaigns though, so at the rate we're going, assuming I run H2 and H3, we won't get to P1 for probably another 6-9 months.