If it were me I'd go with the 4000. The 3000 was/is an excellent tire, and I'm sure the 4000 will be as good or better. The Attack Force looks interesting, but I'm not convinced that tread does much good on a bike tire to begin with. If you get the AF combo, make sure you can get the rear seperately, since they'll be wearing out more quickly than the front.
Personally, I prefer the same tire front and rear, because when I replace the rear I usually put the new one on the front and move the old front to the rear. That way I always have fairly new rubber on the front.