Be careful with the MTH tubular track. The old stuff (catalog number with prefix 10-) was good, the same as historically made by lionel. The new stuff (any tubular track with prefix 11-) is extremely poor quality, made of thinner metal, easily kinked or bent, the ties are very thin tin and painted instead of blued steel (the paint has the potential to create havoc with outside rail ground).
Kirk at USA Track has the tooling and is making the good old-style standard gauge tubular track, and making here in USA. Order via email, this is the best option at present. He also offers extra ties, extra insulators to make your own insulated outside rail sections, custom lengths, and more curve radii than were ever available in tubular.
Switches, the only real standard gauge option is MTH. Gargraves does make some good ones, but they aren't plug and play like the MTH 42's and 72's. The MTH's are also non-derailing. They have their faults but they are the closest thing to original. Ross is coming out with a range of standard gauge switches and in a year or so we may have some more options. Right now, I'd go with USA for track and use the MTH switches with the thought of upgrading to Ross switches sometime in a couple years when/if their line materializes.