It really is a good idea to build your own IMO. You'll be thankful when you crash and need to fix it, you'll know how and why everything works together. And it will need fixing, gravity demands it.
If you want instant gratification with bells and whistles like GPS, perhaps look at the DJI Phantom range, but pleeeease don't do anything silly with it!![]()
Sorry I got it wrong, I always imagined a RTF would be a kit but now you have pointed out the obvious I feel like an idiot!
I am totally happy with a kit, I enjoy putting things together.