I use all code 80 flextrack. The main obstacle is learning how to solder, but it really is not difficult and once you master it you can lay track quickly and efficiently.  The benefit of smoother running more and realistic trackwork is worth it IMHO. The sectional tracks are just too toy like.

As many have already said, please just shrink the 4-6-0 ten wheeler and 2-10-0 decapod to n scale. While you're at it, the earlier suggestion for a 4-6-0 camelback would be nice too, maybe using the same chassis as the 4-6-0?

Joe