For your first question, all frames should be compatible with your parts, the only difference would be in rear wheel spacing (135 or 150) and seatpost size. Since all Marzo forks are 1 1/8" headtube size isnt an issue. As for the frames, the Howler is designed as a 4X frame, so it should be light and snappy, I haven't ridden one, so I cant comment. The Chapparal is a decent frame, its more heavy trail riding oriented. The Morphine, at least to me, is ridiculously overbuilt, you'd be just as suited to get a cromo frame.