An Anshutz, Feinwerkbau, are the best you can get, they are precision .177 air rifles that work really well, the price is high, about 1,500 - 2,500 but they are worth it, open peep sights or big scopes are good on these, and most of the time you need a sight rail riser, but on the lower end, I would say a daisy CZ, it has the basic adjustments like the trigger, cheek piece and stuff on it, that thing with raised sight rails with a giant scope is awesome. These are all compressed air guns. Get a scuba tank with an adapter and you won't need a fill for along time, the daisy runs about 450, Match any of these guns (do ammo tests/ and test different lot #'s) with some H&N/Finale Match pellets and you will be able to put pellet after pellet through the same hole, in a vice the groups have to be measured with a special tool, becuase it is more like just one hole, and the size of the hole is measured. You can't really tell more than one pellet went through, thats how good these guns are, I have more info if you want about where to get one. I own em all, so this is no bs, these are the best, and they win the olympics every time. Anyway thats my recomendation.
MASTERGUIDE