ORIGINAL: bugsNbows
I have that very gun and here's what I put on it... Leupold VXIII 2.5-8 x 36 It fits this "size" rifle beautifully, and was deadly for me this fall. You could do alot worse. The Sightron's I've seen were quite nice and would certainly also suffice. Good luck in your selection.
I'm probably leaning towards another Leupold, especially since I am happy with all the other Leupold's I have. One a side note, what have you found that shoots well in your gun?