Which One Should I Buy

1st off, I'm very noobish. I have $300 (well, exacly $320) in my pocket and i want a brushless system(motor and speedcontrol)... im looking for speed, runtime, and power. Basicly something better then my stock titans. My issue is I cant go lipo yet due to the expenses. I know i would have to upgrade part on my emaxx, but that i can due that gradually (in financial amounts). The first consideration was Novak hv 4.5 or 6.5 but since im unfamiliar with others, I'm not sure what my options are. (there are so many motors!)

thank you,
and i look foward to being denoobed.