Have had great luck with Bushnell 3200 + 4200 scopes, but a 50mm objective is too big to look good, or be of any value on a 3 x 9.

A 4200 1.5 x 6 x 36 is on my Encore-- would be a great choice for an Omega, and you could retain your rear ramp as well.

A 3200 3 x 9 x 40 sits on my Knight Elite-- for the money, a beauty.