I personally like my Hammer 7, and as was said before it is a great tinker/mod platform. I installed a 20rnd spring feed on the top, threw on a CP barrel and got the tank stock adapter on the back. looks cool, feels nice, shoots great.
If you want to get into pump and not need/want to do anything else to the marker I would look at the Empire Sniper, Azodin KP3 or even the Azodin KPC. I myself had a very nice Autococker pump that I built, but decided to move on to something else. Currently looking at getting a KP3 myself