I'm using a blackhawk sportster. Tight fitting case big enough to fit the gun with the stock fully extended.
I drive a Z so the trunk space is virtually non existent so one of the larger cases was out of the question.
There's room for 5 mags. On the opposite side there is a pouch, it is not large enough to fit any eyes and ears in it though.
I purchased this case at Dick's sporting goods for $35.
I also found this picture of a pizza on the hosting site of my pictures, it has nothing to do with rifle cases but here it is anyway.