Of all the times I've been at a feild, I heard that the Imps weren't the most reliable guns around. I've seen them shot though, and it's a fast firing rate it's got- a nice trigger, too. For whoever stated above, I think there's no way you can hate an Impulse trigger- they're light from what I hear (made friend @ feild has friend that lets him use it), and have a very short pull. There's my two cents on the Impulse.
As for an Autococker: They're very accurate, and have tons of aftermarket upgrades to choose from. They're a little slow, so it's user preferance. It can be improved though... you said you were going with the 2002 'Cocker, yeah? Scince it's cheaper, you'll be able to get the two things necessary: nitrogen and a new barrel. With those two, your 'gun will be working great. Although it works fine out of the box, it's a world of difference with those upgrades. May I suggest anything Crossfire(Nitro), or DYE(Barrels). I always heard nothing but good things about the DYE Ultralight, if you're looking for a cheaper but still high quality barrel. If I remember right, it's 95.00$ Oh, and the trigger; it's very easy to get used to. And it isn't as bad as people always say it is; trust me. Unless you've been using a trigger with the pull length of a mouse click for a very long time, it ain't a problem. My three cents on the Autococker.