We are still struggling a bit with this too. I think we will end up keeping it simple by buying the half sized bottles of spices we use regularly and a couple of the multi-spice bottles Ron just described. While we have enough storage space right now, I imagine after a few more trips we will have less and less. The place I am eyeing for storing the spices right now is over the main coach door. Some folks have apparently built a small lipped shelf around that decorative piece above the door to hold keys, flashlights, etc. Should hold enough spices. Not sure Joni would like them displayed like that tho.
This place has a lot of interesting products (expensive) which could be duplicated more cheaply. http://www.tubularspices.com/
My one large go-to spice bottle is Kirkland Mesquite Seasoning. A little goes a long way and I use it in pulled pork, short ribs, salmon, sauces, soups, steaks, burgers. It has a sweet and somewhat smoky taste.....similar to smoked paprika, which I love as well.