Jared, no experience with it but possibly the iPhono 2 may be the least expensive phono stage offering variable EQ. You can see it here - http://ifi-audio.com/portfolio-view/micro-iphono2/. Also, Michael Fremer may have reviewed it.
Others are available, reaching upward into 5-figures, depending on what your budget allows.
Others are available, reaching upward into 5-figures, depending on what your budget allows.