If you are set on the Nexstar or Alpha or any other particular airframe I recommend that you get the ARF version of the plane if available(May need to be ordered). I say this because this will allow you to pick a GOOD engine and GOOD radio package. Not to bad mouth what comes in the RTF's but they are usually minimal and you have paid someone to do an easy assembly job when you could invest the money on better equipment.
I also agree that you should check with your club instructors to see what they recommend for the plane you choose. Everything must work together and sometimes the LHS guys are like used car salesmen if you know what I mean?
The wing "gadgets" can be nice for a few flights but watch for a drastic pitch trim change when you remove them. The AFS is a paperweight and a poor one at that IMHO.

These are all my opinions, you are going to get a lot of them here. Just sort thru them and pick what YOU want and enjoy the hobby.