Dont know your budget, nor the price difference, but have you considered the synthezised version?
If you not already have done it, remember to do the grip test !
I dont have an MX-3 myself, but Airtronics is good, and it has good features. I really like that big display, which gives a good overview ( KO could learn something here
If it should be better than the MX-3, then it's 3PK or Helios. The faster response might be worth something, but other than that, I believe that these radios are overkill.
In short: To me, the MX-3 looks like a good radio, with high value for money.