I've also been struggling with that all important consideration of layout height. My old layout was at 50 inches which was great for viewing but slightly awkward for reaching cars and switches towards the back of the layout. Lowering my new layout an inch or so would go a long way to making operations more comfortable, but I'd have to bend that much lower to view the cars at track level. Should I favor railfanning or operations with my railroad height?
All said, I'm glad to finally be in a position to consider these things for my layout. Now it's getting fun!