I would get a 7.1:1 for the topwater, 6,x:1 for the all around setup, and a 5.x:1 for the crankbait setup.
I tried using a left handed baitcaster once and that is it for me, I couldnt reel it in smoothly, and lost fish because of that reason. Stick with what you know, if you are comfortable using a right handed reel, use a right handed reel. Why do you want a left handed setup for topwater anyway?