Steve, I know what you mean about curves being a pain to cut. Here's what I use:
My compass is just a 6' long, heavy gauge, perforated steel strap, most commonly used for hanging garage door tracks and openers. Get it at any home improvement store. Doubles as a straight edge.
Unfortunately, the holes aren't at one inch intervals, but it's still easy to work with.
The real key is a good saber saw. I've had this Bosch for over 20 years. I couldn't imagine building my layout without it. Good tools make short work of unpleasant projects, and could even turn them pleasant!!!