Matt, if you don't want to spend $300+ the JR XS3 Pro is a great radio and NO CRYSTALS...LOL!
If you are going Spektrum then the M11, or Spektrum JR radio is the ticket. Alot of good radios, just price that seperates them really. Everyone has their favorites, just like with the cars!
The P5X is a great engine, i've had alot and my most recent was a P5X it was the best I ever had! Sold it when I got out of 1/8th scale recently.