As Graybeard said, Beretta and Browning are the two that come to mind first in that price range, but your friend should try both before making a decision. Both are great guns, but very different. Browning's tend to be heavier, Beretta's lighter and more dynamic. I like heavier guns, but others like the more dynamic swing of a Beretta. Stock Beretta's have a cast off for right handers, if your friend is a lefty, he needs to look for left handed model. Browning's are straight so are equally good...or bad for either left or right handed shooters.
With shotguns, fit is everything, so your friend shouldn't buy the gun that looks best to him, he should buy the one that fits best.