The HK600GT I have personally owned and I can say for a fact that you will spend more money upgrading it (head, tail, converting to TT, main bearing blocks, tail block, main gear, one way, motor mount, pretty much everything except the frame sides) over purchasing a used Align 600 which are all over the place out there. Then we get into electronics as Steve stated. That is where the real money is considering just a servo can cost you $75 each. I would definitely go used before I purchased anything from hobbyking.