RE: Made a choice and hope that i don't regret it.
Jetmech said it all. There are no bad choices when choosing a radio for RC if you select one from the major manufacturers, those being Futaba, Airtronics, Spektrum/JR, Hitec (did I forget one?). All do the same thing and do it very well. It then comes down to a personal choice.
I've flown with Futaba, Airtronics, Spektrum, and Polk. My preference is Airtronics and Spektrum, but again, that's a personal choice. My first was Airtronics because that's what my instructor used. Later, I saw the Spektrum and really wanted to try one out, so I bought the DX7. That was when they first came out. I've NEVER.. NEVER had a problem with that radio system. One main reason is because I am very diligent about the charge level of my battery packs and never let them go below a certain charge during my flying day.
I have since switched to 5 cell 6 volts (nominal) and thus have never had the voltage drop to below that re-boot threshold. I now own two Airtronics radios, have ordered a third (their RDS8000 2.4 GHz system) to play with, not that I need it, but because I want to fly with one. I also own, as I said, a DX7 and recently picked up a DX6i. I also own a four channel Futaba basic radio system for a trainer that I play with on occasion... always fun to get back to basics to find out all the neat stuff you forget about when moving up to more capable aircraft.. but that's beyond the scope of the subject here.
Bottom line, as most have already said earlier, no you did not make a mistake. The Spektrum is a fine radio system and will give you lots of fine flying time and performance.
CGr.