I have had most every radio out there in the past few years (within reason). I have been the most die-hard JR guy you could find. I also did my time at Horizon and had all of the Spektrum radios out there. Here is my take:
JR:
10X- best radio I have owned, best balanced (w/72mhz antenna)- not and option on 2.4GHz due to latency, not being native 2.4GHz
9303/9503- Excellent workhorse radio with the "JR Feel". Slow in comparison to modern 2.4GHz protocol. It will be the same speed as your DX7, but not the same as the DX7SE, Futaba FASST or JR DMSS
12X- same as 10X, but balance is off due to not having the long silver antenna sticking out. I modified mine and it is the most perfect radio out there except for it being slow (see 9303 info above)
11X/XG11- Horrible. I have owned them and I hated them. I would rather fly with the RealFlight transmitter. Super plastic feeling, the gimbals are a mile and a half apart. If you like the DX7, you will hate holding this. I bought my XG11 from a guy who owned it for three days. I sold it a few weeks after buying it. The guy who bought it from me sold it three days later. They just got it all wrong with this radio.
XG8- More "normal" gimbal spacing. Still extremely cheap feeling.
XG14- Same song, different verse. Basically expanded capability XG8
In summary, if you want the "JR Feel", your radios are 9503, 12X, DX7, DX7SE. These are all old protocol and are noticeably slower than current offerings.
Futaba:
I would really only consider the 8FG or 14SG. I have tried the 18MX, but it has that super wide gimbal spacing and just doesn't do anything for me.
8FG- probably your best option. It is fast, low latency and feels decent. I was surprised that the gimbals felt as good, if not better than my 12X. Futaba tried their best to make a radio as close to JR spec as possible and that is why they are selling so well. I think it was really a perfect storm. Spektrum released the DX8 with its massive issues at the same time and that opened the door for people to try the Futaba. Most of them never turned back.
The 8FG has very non-Futaba programming (trust me, that is a good thing!!!!) The gimbal spacing is reasonable, the radio has decent fit and finish and as I said before the gimbals feel good. I bought this while my 12X was down. The speed of the radio made it impossible to go back to my 12X.
14SG- several improvements over the 8FG- thicker, wider spacing between switches at the top and telemetry. I have one now and it is fine. I wish they had done a little better with the aesthetics. It is not the prettiest radio, but not offensive as the new JR trannys are.
Spektrum:
Where do I start? Having worked at Horizon and dealt with the recalls I will never own another one. Period.
DX8- Didn't like the feel of it that much. Too many issues in the beginning. They have been worked out, but I still don't care for it.
DX18- Gimbals feel horrible to me and are spaced out like the high end Futaba. Not my thing.
DX7S- If I had to have a Spektrum, it would most likely be this one.
Overall- Spektrum have done some amazing things bringing 2.4GHz to the r/c industry (really a Paul Beard development purchased by Spektrum). I don't like their chrome plating of everything. Like we say in the mobile audio industry- you can't polish a turd, but you can chrome it.
Conslusion- If you don't mind the latency, the old style JR radios still have the best feel. Other than that I would encourage you to give the 8FG or 14SG Futaba a try. Remember- this is coming from a die-hard JR guy.
The best advice I could possibly give over all of the info above is to get one in your hands. If you have the chance to go to IRCHA, you will get to sample each one of these.