After having trawled the internet looking for testimonials (Not having played a tourney yet, any Midlands teams looking?) myself and two mates have purchased second hand "Shockers" £350 to £450 is all you need spend for a respectable working rig.
Big (Yes, something to hug), Ugly (imposing) but well balanced until you stick a 1.1ltr bottle on.
The gun is simple to work on, on arrival one gun would not fire - against advice we stripped it to pieces and had it fixed within the hour (No worrying about the timing of the pneumatics).
Big down point of the "Cocker" is it must take ages to clean when you take a hit on the front.
As said above, you won't know until you try, we are all different!