KEF LS50 Wireless - preamp suggestions for Marantz TT


Hi folks!
Would appreciate suggestions for a preamp that connects my Marantz TT15S-1 turntable to the KEF LS50 wireless. 
People suggest the PHO 701 or the Cambridge Duo or the Rega MM MK3. Budget is $500 or less.
Thanks!
joezedlove