You didn't mention what type of surface you will buggy on. This will affect the size kite that you need. If you're talking about a long beach at low
tide, a smaller kite and a good harness will do. On grass in a park you'll need a bigger kite and usually no harness.
A Blade III will be more user friendly than a Razor. You don't have to watch it every second. The Blade will rarely overfly the window and has
excellent upwind abilities. The Blade is more predictable and has more lift which can be fun or a challenge, you choose.
I've flown both Razors and Blades. I currently have four Blades in my quiver and no Razors. Does that answer your question?
I suggest that you get a 3-meter BladeIII. Practice static flying (standing on ground) it so you can fly it by touch (eyes closed). When you can do
that, then get in a buggy.
---Always fly so you can fly another day.---
CrashLama