Geez, are you guys freezing your paintballs or what? They don't hurt that bad. Where I go there are 'speed limits' on the ball velocity. I can't remember, 600 fps? As long as you get hit by a legal gun that has be setup fairly, it's not too bad. I just wear goggles. Sometimes I think I should wear gloves though because it does sting to get one in the fingers. I've never been hit in the throat. I normally play on an outside field, so I think it might be more long rang stuff I'm used to. I've never thought about wearing a cup. How often is your crotch exposed anyway? 80% of the time I get hit it's in the head, other 20% is shoulders.
I have a tippman procarbine. It's a good gun. My buddy also has one and he bought a new barrel for it (can't remember which one). With his aftermarket barrel, his range and accuracy is way better than my stock barrel. If I played more I'd definately spend money on a good barrel.