Cummins is in fantastic form at the moment, still a long way to go between now and then though. Always liked Wood, he's got a nippy, skiddy sort of thing going on and can be very destructive when he's fit and in form, just a shame he's had so many problems with injuries over the years. With regards to the attack, I always thought the way to go was to try and give yourself as many options as you can, i.e. don't pick 3 low 80s swing bowlers in the same line up. Whatever the conditions are they will suit some bowlers over others, so give your team as many chances of finding the player for the conditions as possible. Even in England you get days where it's not moving much through the air, and then you need someone to hit the seam like Broad or get it through quicker like Wood.
Once you find a player in form for the conditions, they can reap the benefits whilst the others hold up their end and chip in now and then.
On the batting front, I don't think we're miles ahead of Australia once you chuck Smith and Warner back in. They could do with an all-rounder like Stokes, but they've players like Wade who could do the Buttler type role should they actually get picked - some of their selections in the last couple of years have been somewhat bizarre to say the least.