I'd agree about Devil's Rejects - House of 1000 Corpses was okay and all, but Devil's Rejects felt like a real movie and had some pretty good stuff in it. I'd been avoiding buying House of 1000 Corpses hoping that a director's cut would come out, but apparently all the extra footage is lost and Best Buy did a 2 for $20 on the Rob Zombie movies this week, so I bit.
By the way, the door is wide open for a prequel even if they did kill off the family at the end.