Wow Will you're all over...2 rail...H.O.....
I had gone with Atlas with my 3 rail layout and I would again. Right now getting Atlas or Scaletrax is a bit of a job but still I enjoyed Atlas's product. That is my pref. but Ross/Gargraves is a good choice as well. Ross offers a huge selection of turnouts also which is a plus as it opens things up operationally.