I would say go with Lodge. Camp Chef ovens are imported and while many people use them, I like the finish of the Lodge ovens better. Cabelas brand ovens are made by Camp Chef, if I am not mistaken.
My first oven was a Lodge 12". I now have them in 8", 10" standard, 10" deep, 12" deep, and just got a 14' standard. The basics are the same regardless of size, it just depends on what you are cooking on what size you use. A 12" is a good starting place.
Deep ovens work best for stews, soups, or any "tall" food. The standard depth ovens work great for bisquits, pizza, dump cakes, etc.
I visit campcook.com quite often. Folks are really helpful there. I am fairly new to it as well, but it gets addictive pretty fast.