Looking to buy an AR-15 varmint style gun. Been looking at the Bushmaster varmint series. They have the shorter barreled Predator series with a 20" chrome moly barrel. It comes with a 1 in 8" twist. They also have the Varminter with either stainless barrel or chrome moly with a 24" barrel at 1 in 9" twist. I plan to be doing some varmint hunting and some predator hunting. Rabbits and prairie dog sized critters on up to foxes and coyotes. Don't know what size bullets i'd use. I'd imagine 55 to 60 grainers, but open to suggestions. Want to be able to shoot long range if possible. Also having a hard time deciding on a good scope. Don't have a lot left budgeted for that part, but am looking for advice. For the same money i could get a cheaper Bushnell at 6-18X40 or 50 mm, or for the same money just get a 3-9x40mm leupold. I'm leaning towards the leupold, but looking for suggestions. Any help or input you got would be great. Am open to other brands an things as well. Right now cabelas has them new for $1150 before taxes and such, then would have to spend bout 300 on a scope and 100 on a bipod. Good deal at all? Thanks in advance.