Personally, I'd recommend buying a gun at a local store, especially if they own a field near you. Around me there's a field and store called Fox Paintball...the prices may be a little higher than website prices, but at least with Fox, they include lifetime labor with your purchase, so if you need work done to the gun, all you have to buy are the parts. With that, you also get a free 1 year membership to the field that gets you reduced admission and paint fees. Might be worth looking into for you.
Also, that's a pretty low quality gun...I have a lot of faith in Tippmann, but the common rule of thumb is that if comes wrapped in plastic, it's probably not all that good. I'd recommend checking out something like a Smart Parts Ion; fantastic starter gun. They have a new one out too, but I can't think of the name of it. Check out
SMART PARTS though.