I've used Peco code 100 On30 track throughout. It's extremely well made, reliable and matches the rustic look I'm going for on Thunder Mesa perfectly. Plus, I had a lot of it left over from the previous layout.
Of course, laying the golden spike on a model railroad doesn't mean you're anywhere near finished. There's still tons of work to be done on scenery, structures and special effects. Now that trains are rolling, I'm even more motivated to tackel those big projects. See you on down the line!