Now that you have read many contributors comment about your preamp, amp, speakers, system, etc., I would like to comment on your original question.
"how to match a power amp to my system using an integrated amp as a preamp."
As a general rule of thumb, you should try to have the input impedance of the power amp be at least 10x the output impedance of the preamp. Or the output impedance of the preamp section of your integrated amp in this case.