[zoomie]

http://www.opticsplanet.net/nikon-ri...ters-4x40.html

http://www.opticsplanet.net/leupold-...x-reticle.html

Or if you get the urge to totally blow your budget...

http://www.trijicon.com/user/parts/p...4&categoryID=3




But... don't forget to budget for quality rings or a mount. Don't go cheap.