I mean no offense, but I think that it would be really tacky to register. I've never heard of that and if I got an invite to a house warming party with a gift registry thing enclosed, I wouldn't go.
You asked for opinions, right?
I would bring a gift if I got an invite to any housewarming/open house party for a new home buyer, but would be offended if I got a registry thing with my invite.
Hope I helped.