Best used preamp processor

Hi, I want to know what is the best option for a used preamp processor under $600?"I dont need hdmi.and dont need balance output,the player is a sony dvd blueray and a modified toshiba dvd.

Hi, I want to know what is the best option for a used preamp processor
under $600? many Options I have are:
sunfire theater grand ii
proceed avp-s or avp
rotel rsp 1068
outlaw 990
yamaha dsp A-1
integra Dtc 9.4
theta Casanova
ead, I want to know the best for theater and music.Please help me to choose. I have B&w 602, an center cc6. My power is a rotel 990 for front speakers and another rotel for the others.I like listen concerts in dvd or cd.I'm 30% movies.