When looking to get a paintball marker, the first thing you should look at is your budget. Most well built paintball markers range in price from $99-$899. You then have to decide which type of paintball marker you want such as a rifle or a pistol.
Other things to look for when buying a paintball gun are how many rounds will it hold and how much CO2 it will use. Some markers use a CO2 tank and other use cartridges. It is up to what what you like best.
If you are in the market, here are the paintball markers that I would recommend checking out: