Thanks mr_matt, height is very important as well. I've pretty much settled on 36" to the surface of the finished table. That way my bar stool's fit right up to it!

The old table has worked well at that height. Sometimes when a model is on its wheels you need something to stand on to work on the inside. But I'll take that trade off as that height is comfortable for building where most plane parts are only a couple of inches off the table.