90r or a1
90r has the best motor for performance and longevity, those 110 zongers like in the a1/dx3 are decent but slow reving compared to the 90r with irk.
dx-3 is a nice little bike for the money i wont lie, my bud has two that he bought from tbolt. he likes them but now one has the jialing 125 motor. the zonger motors always seem to have shifting issues, every single and i mean every single zonger or lifan my friends have brought to me to fix in some way or form have a shifting issue. one of my buds dx3s did it right out of the crate.
you can fix, but why bother on a new motor, and sometimes in not a def. fix.
90r all the way, then the a1, then dx3 then the c3 from the models you mentioned.
fyi, PM me what you wanna spend, i have a built honda 50 i am gonna sell, i can have it shipped to you at your expense, i am 3 hours from ya!