Have a couple Nikons on my rifles, I like them very much as well. My 452 currently wears a cheap Bushnell XLT 4-12x40 with the DOA reticle. It works really well, got the hash-marks figured out for distance with a .22, and is cheap. The glass doesn't look too bad either, but when I've got it and another rifle out at the same time you can tell it's cheaper glass when switching between the two.
I have a Prostaff5 3.5-14x50 on my 527 .17 Hornet and I love that scope. If I had to recommend a scope under $500 it would be a Prostaff5.