"Brand" opens up a world of opinions.
Personally, I think a Marlin 30-30 (I'm assuming yours is 30-30) cries for a fixed 4-power scope. Take your pick.
I stay away from the cheap, Chinese knock off brands, but Japanese glass is usually pretty good.
I wouldn't put ultra-high end glass on the Marlin, but shop around and you should be able to outfit it nicely for < $400.
Great rifle, by the way. I have one and love it. It's a classic, and makes an excellent deer hunting rifle.
XD-40 service, XD-9sc, member GeorgiaCarry.Org, National Rifle Association, Gun Owners of America, North American Hunting Club, Rocky Mountain Elk Foundation