I would try and find an older impulse. Low pressure, high efficiency ftw, cheap, and fully customizable.
got one FULLY upped for sale PM me if interested, or search for Impulse in Misc FS.
That said, theres all kinds of CRAP in this thread. No gun shoots HARDER than any other gun. Field limits MAX is 300fps. Most will hover around 275-280fps though. The masks lense is rated for about 400fps. If you get bunkered (shot at close range) at even 250fps, you WILL bleed.
As far as the tank fills go. A Co2 tank is about 850psi until it starts to go empty, then it drops rapidly. Co2 tanks are refilled based on a tank cascade or balance method.
Compressed Air (aka Nitrogen, HPA) store compressed air at pressures of 3,000psi and 4,500psi. 3k is steel tanks, 4,5k is always fiber wrapped tank. You can fill from a compressor IF you have a $5k booster pump, but you'll also need bottles of compressed air to get the bulk of the tank filled using the cascade method, THEN change over to the booster/tank/compressor method... You CAN run the gun off your home compressor, but it has to be a low pressure marker. The Tippmann IS NOT, and wont properly cycle at 125psi, it needs 400psi. My Impulse will, however since the high pressure reg is set at 110psi.
What you buy when you pay more for a gun is quality, size, weight. Full electo guns are cheap now. Accuracy comes from the barrel choice, and quality of paint and its fit WITH the barrel of choice which is why you see barrel kits. They have interchangable sleeves that match the paint you shoot.
The Tippmann you are looking at is a great gun. BUT it has all kinds of useless crap add ons. It may look kewl, but you dont need and will never use a stock, nor the clip. They are notorious for being tanks. And you can bring it home, and WASH it out (literally), oil it up and put it away til the next time you play. Itll be ready!
Need more info? Just ask.. I know JUST A LITTLE about paintball //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif