Well...it's true that an E Frame will help u shoot much faster...but...because of their nature...you can set it up, to have a Max ROF of whatever you like...if you have no eyes fitted, and set it to Factory Fast...thats only 10.5 Bps, so assuming you have a loader that can feed above that, say a Revy or Eggy would be better, you wont chop due to shooting too fast, and you cant short stroke an E blade (short stroking is, when you dont pull the trigger far enough)...that way, you can limit your gun, to how much paint it will shoot, in any given moment.
That said...dpending on what area of the field you play, determins how much paint you need to be able to shoot...as a Backplayer, you wont last long with 8 or so Bps...wheras..as a front player...that will be fine to be getting on with..as you dont tend to use paint to keep people in, more for fast snap shots etc...or mugging runs, where volume of paint isnt neccesary...also, if your at the front, hanging out shooting 18bps strings..chances are...you wont be there for long!!
Any questions..feel free to ask.