Red,
I know you are getting a lot of input and they are all good.
Years ago I started with the old New Braunfel's offset-smoker, nice little cooker that I believe is a great way to start and heck, even finish as far as I am concerned. But now, they are made by charbroil and are a bit lighter, but yet, you can start off with one of these and still do real well.
Horizontal or vertical is just a direction.
So, grab one that you dig, in your price range, and get smokin'.
Plenty of time to go high dollar later on, if you want to.
The old adage rings true, it ain't the pit, it's the pitmaster.