Can someone help???? I did a search but nothing specific came up...
And reading 58 pages of the TRex thread is a daunting task!

I’m still a beginner and would like to eventually do some mild 3D. So, after much research, I decided that my next heli purchase will be a TRex 450.

What I need to know: What does the model designations S, SA, SE, X, XL mean? I know that the SE is the top of the line, but where do the other models fall?
Also what is CDE and HDE?

I plan on getting a Spektrum DX7 for the this heli.
What other equipment is recommended? (I don’t have an unlimited budget, but I could piece it together little by little.)

Thanks for the help!