Ken, welcome to the scale (hopefully!)
All the track you mentioned is hirail.
Scale equipment will run on SHS/MTH S-Trax, but is not fond of the switches.
Lionel FasTrack is compatible with S-Trax(with a small modification) and will also run scale equipment. However, the switches haven't hit the streets released yet, so the ability to run scale on them is yet to be determined.
With 20" radius on the diverging route for both Lionel and SHS/MTH switches, they're really too sharp for scale equipment anyway.
For scale equipment, I would suggest a 27" radius as a bare minimum.
American Models also has a track system using larger rail, but once again, the switches are set up for hirail. While I haven't done it, I'm told the switches could be modified by shimming the frog and guardrail for the scale flanges.
http://www.americanmodels.com/misc/track.html
Scale track is available from Tomalco and Scenery Unlimited.
Tomalco's website is down, but is available from Hoquat Hobbies:
http://www.hoquathobbies.com/T.../TomalcoTrack100.htm
Scenery Unlimited markets Shinohora track:
http://www.sceneryunlimited.ne...oducts/shinohara.php
My track is mostly Shinohora flex and switches, with a couple of discontinued Old Pullman switches thrown in.
Rusty