There are plenty of options out there for remotes. Do you want a trigger style RC car remote or an Airplane style remote? Futaba will always be a solid option in either case and I recommend having some extra channels available just in case. If you plan to use up to 4 channels, look at 6 channel remotes.
https://www.amazon.com/Futaba-6-Chan.../dp/B0051VUX8M - Airplane style remote.
https://www.towerhobbies.com/cgi-bin...?&I=LXDGDR&P=3 - 4 Channel RC Car remote
https://www.towerhobbies.com/cgi-bin...?&I=LXGTNB&P=3 - 7 Channel RC Car remote
If cost is an issue you can look at some cheaper lines but I am a firm believe in the you get what you pay for ideology.