High RoF is relative. Is 15,25, or 50 bbps high to you?
What brand are you looking at?
Honestly, most aeg's are going to perform roughly the same if they are from the same company. That is, an aug is going to perform roughly the same as an m4 the same as a g36, from company X, stock gun for stock gun. There are differences in minor things, but overall choose a gun whose ergonomics and looks appeals to you, you can make almost any aeg perform as well as any other aeg with some work.
I'll give you a better deal than Heroes or Vanguard, Pm me.