I use Spektrum. If you like the brand and can wait, hold off for the new Dx6. Shouldn't be long now. Has voice and many improvements over the 6i.
Also, keep in mind, most brands are just fine. It's a matter of the things you want. I think Spektrums are easy to program. Others want more customizing choices. Also, Spektrum binds with the Horizon Hobby line of BNF vehicles. You will of course hear from those who think band x or y is junk but won't be able to give you a logical reason.