Best Surround Reciever Under $500 used

Wanted to get some opinions on this. I am still trying to make a decision about a starter HT system and I'm having a difficult time making a decision. From my research, it seems that there are a plethora of surround receivers available for under $500 used. This makes the decision even more difficult. If you had $500 to buy a used surround/HT receiver, what would you buy? Thanks!