Any 6ch RX will work fine on your HBK2.it needs to match your JR TX frequency and make sure the RX is positive shift. Berg has some cheap ones on helidirect as well as some available at BPhobbies also. When you get your Rx.use the
www.helifreaks.com videos on the HDX300 build. That is almost the same heli as the HBK in principle. Not an exact match but has a very detailed setup video on the telebee gyro (also called the align gyro) as well. Also look in the general build section or the heli setup 101 thread.that will basically show you how to set up almost any heli properly and help your flying skills by having a well set up machine.
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Of all the things I ever lost........................................ I miss my mind the most!