Id buy chrome, chrome will get you home.
it just depends on what your wanting really.
if you want a military clone get a 4150cv steel barrel with fully chromed barrel and chamber.
if your target shooting & plinking a 4140 cm steel barrel with no chrome will do fine.
if your into serious target shooting stainless is the one to get.
if you can find a good deal on a barrel you had better pick it up. they ain't getting no cheaper.