If you think you'll want to take it a bit easy then the Rage is certainly a great kite. Very easy, very predictable, very nice. Definitely one for the quiver. But when you want to push harder, it doesn't have a lot more in it.
The Blade on the other hand immediately feels more powerful and can pushed to dangerous levels! With the bridle adjuster it can be set at different Speed vs. Lift settings too.
If budget isn't a huge issue and you are in no rush, it may be good to get the Rage first and then progress to the Blade later. Otherwise, just go for the Blade but try it in lighter winds to begin with!
Fair point!