This Quicksilver should fit the bill. I own one!!
http://quicksilveraudio.com/products/phono-preamp/
INPUT IMPEDANCE SELECTION The internal circuit board has a switch for imped�ance selection(47k or 10k) and a switch for capaci�tance selection(470pf or 270pf). Normal input impedance is 47k and 270pf but Shure cartridges require 470pf of capacitance and Grado car�tridges require 10k of impedance. 10k is also used with moving coil cartridges.