Thanks for that info Clark, I really appreciate it.
You need to know what size bike you need too. What's your measurements? Height, pants leg length, and maybe weight if you are real heavy or real light will matter more. It's more about frame size than tire size. I have a 13" frame with 26" wheels my son rides and a 60cm frame with 26" wheels I ride. Sometimes sellers have no idea of size other than wheel size and it matters. Just measure the seat tube to the center of the crank and the top tube length to get a good idea. Trek, Specialized,Diamondback,all have size charts on their web sites.
You might make anything work but size does matter in this instance. My first 2 bikes were really too small but I didn't have enough experience to be able to start knowing what I needed for a couple hundred miles.