[Bellerophon]

For a first time player, a substantial portion of that budget should probably be set aside for gear and safety equipment. Get ballistic goggles that seal to your face but don't fog easily ($40 - $80), high boots that can keep you from rolling your ankles ($60 - $120), a camouflage uniform ($40+), a camelback or some canteens ($30+), and other miscellaneous things particular to your play style. If you have all of these already, ignore this. If you don't, take my word for it that these things will make a bigger difference to your effectiveness than any airsoft gun you can get for that price range. As already mentioned, there are airsoft gun reviews all over this site.