I would personally go for the Etronix Pulse systems, I am running the FHSS Core RC version with blue receiver and I can't fault it. Fantastic for the price and has all the functions and adjustability of a top end radio. Has 10 model memory and the best bit ... Extra Receivers cost - £20
Etronix Sticks:
http://www.etronix-rc.com/etronix-pu...dio-system.php
Etronix Wheel:
http://www.etronix-rc.com/etronix-pu...dio-system.php
Receivers:
http://www.etronix-rc.com/etronix-pulse-receivers.php
Hope this helps!