I'd rather see a Predator 3 b/c the Aliens TBH, IMHO, have received their fair share of the spotlight. I think it's time the Predator received some more attention.
I was talking to some people and we think the best way to do a Predator 3 would be either a) a desert town (since we've already had the city and jungle) or b) a prison, with a riot happening.