If you haven't been to an RV show find one and go. Take notes, look at as many manufacturers as you can, and see what feels right. It's one thing to sit on the computer looking at floorplans and another getting to walkthrough and really get a feeling for what will work for you.
Make a list of features you MUST have and those that would be nice to have. It may take some time to get to that point, but that'll help when you get the list down to a few models.
If you're going to look at used RV's be careful. Really pay attention to the condition and signs that maintenance was neglected. There's no such thing as a minor water leak when looking at used units. Don't trust the dealer or private seller without looking yourself. If you don't know what you're looking at I'd recommend having a mobile RV mechanic take a look.
