Some interests and responsibilities have kept me from my tanks for several years so it's time to get back. For context, the last time I worked on my armour, HL had not yet entered the world of 2.4GHZ! Here's my questions and the search function here has led me down some deadend roads, but if anybody has some good links please post them.

Question: What is the most economical way to upgrade my tanks to 2.4GHZ? I have a Flysky FS-i6 radio and a receiver on order ($54 CAD and free shipping. Craziness!). Currently, I have HL tanks with RX-13, 14 and 18 boards (PzIII, 2x Jagdpanthers, Tiger, KV-1) and an old Mato M4A1 76 with its original guts, although its being converted to a Grizzly.The PZIII, Tiger, and Sherman are airsoft, the remainder are IR. Ultimately, I'd probably get everything over to IR although it's not a rush on that.
I'd like to get rid of the track recoil and achieve better sound. Is the new TK10 recently announced here the most viable option? Any advice on how best to handle the older RX13 and 14 boards?

All advice and links to any good resources and info are most welcome. Thanks!

Mike.