For over 6 years I've always used my Tippman Pro-carbine:
With a smart parts barrel.
I love the "rifle" feel of the gun (more natural to me), and get excellent shot consistancy. Its light enough and balanced such that I can fire one-handed if I need to, and often do. I love "firing on the move" as I am coming up on the last few men left on the field, and pointing them out to my teamates with my free hand.
It may look basic, but I assure you I've put paint on the masks of quite a few players who made fun of my "rental gun".
It strips easily and has a tool-less velocity adjustment. In all the years I've had it, I've only broken 3 cheapo field-paint rounds in the gun.
My kid brother has a 98c (Flatline/Smart parts barrels, response trigger). I've used last week and did not like it as much as my own gun. Even with a drop forward (and using the smart parts) it felt heavy.