What is the best used system under $1000?

I purchased an NAD 3150 integrated amp and the 4150 tuner for $150. I then purchased an NAD 505 CD changer for $25! I also found a Thorens TD-160 MKII for $45. AND IT ALL WORKS! What speakers should I buy for my set-up, used of course, that would satisfy my budget of $1000? I found a used pair of Apogee Centaurs for $500 or B/O. I think my system is under powered for them. I also have found a used pair of a Paradigm V3 monitors $175 and a pair of used KEF Carina II's for $75/pair and Dahlquist DQ10's for $500. Any thoughts or recommendations would be appreciated for speakers and phono cartridge