To say you want a DX you gotta understand the DX format first. I don't see how most of these figures would even benefit from PERS which is the defining factor of a DX. Jason with PERS? You'd have to lean really, really close to see which way his one functional eye is looking. Leatherface? Same deal as, despite having both eyes functional, the eyes are set back in the mask. Michael Myers? Same as Leatherface. These guys were designed to achieve that soulless look having the shadows drown out their eyes. Maybe Freddy and Pinhead (if possible in 1/6), but neither would really justify the DX price, especially since there really aren't many accessories to include with those two.
I'd rather see Sideshow take a stab at revamping their old horror figs in G.I. Joe quality (R&R and Zartan), and give us almost the same quality at $75 less.