CCI Phantom with a 14 inch barrel, Vertical CO2 adapter, Dye grips, and a hopper feed port.
A new barrel isn't necessary, but 12 inches is the optimal length for accuracy (or so I've been hearing). If you have a vertical adapter, I'd recommend a stock. You can get them from phantomonline.com for $40 - $60 depending on your setup. If you don't like autotriggering, you can remove the pump spring altogether, which also aids in reassembly. A red dot sight is good to have, but not necessary. Most of my sniping kills were done without it, but seeing as I do use it occasionally and it doesn't get in the way, I keep it on my gun for those moments when it comes in handy. Also, a 50 round hopper is very nice. I always play with only 50 rounds, and having a big VL200 makes noise and gets in the way (plus it's another target).
This is the most accurate marker ever; also reliable and extremely gas efficient.
In the event that a ball is chopped (very, very rare), sniping won't happen.
The phantom has been around for a long time, and CCI hasn't made very many changes since the first markers were introduced. It is a very inexpensive gun with a starting price of about $175. There used to be a problem with the front and rear screws with the original phantoms; they always came loose and you ran the risk of the gun literally falling apart in your hands on the field. CCI fixed this by putting o-rings on the screws to ensure a snug fit. Now the gun is flawless. Cleaning is very simple, and once you get the hang of it, so is reassembly. I won't get into the details, but the simplicity of the gun can make putting things back together frustrating until you've worked with it for a few weeks. Make sure you keep an eye on the plastic ring on the end of your cocking handle bar! Anyway, 5 friends of mine and I purchased phantoms together because we wanted to try something different, and we've been playing twice a week for 6 weeks now. I have a 12 ounce tank and fill it after playing about 17 or 18 games, and we fill our hoppers with only 50 rounds, only about half of which we use. The gun uses gas or liquid and operates the same with either. None of us have had a single problem save for when a ball gets chopped, which makes the paintballs drop down after shooting. Chopping only really occurs when autotriggering (pumping constantly with the trigger held down). When I chopped a ball, I took off the barrel and ran a squeegee through it, put the barrel back on and kept playing just fine. A friend of mine chopped a ball real bad one game and paint got up in the elbow. I covered him and he field stripped his gun, cleaned it, oiled it, and had it in working order again in a few minutes and we went on to win the game (try that with a 'mag or 'cocker). A word of warning: There is no mechanism to prevent you from double loading. If you don't know how to tell if the gun is loaded by feeling the trigger, this might be a problem. My advice is to just keep it unloaded until you really need to fire; otherwise, you run the risk of chopping, or shooting 2 balls at once, neither of which will hit your target. Also, in becoming familiar with the phantom, be sure to pull back pretty hard on the pump handle at first. Sometimes a ball will load into the chamber but the gun will not cock. To solve this, you could double load, or turn the gun upside down (to prevent double loading) and cock again. Once you're familiar with using the Phantom, this isn't a problem. This gun isn't for speedball players, it's definitely for people who like to play with strategy out in the woods and away from all the bunkers. If that's the way you like to play, then I'd venture to say that this is the perfect paintball gun.
Accurate, reliable, simple, inexpensive, and conservative on gas. I recommend this gun to anyone looking to improve their game by learning how to play with a pump because of these reasons. And if you've ever seen the Phantom, admit it, it's just plain sexy!