The Creek gear will costs you double what the Cambridge gear cost (new and used). You do get what you pay for between Cambridge an Creek, however I still consider the A3i a total steal used. Two sold on eBay in the last month for about $225. You won't find a Creek for that price that is 60 watts and comes standard with phono. See the reviews at AudioReview.com
BTW, I have both a mid-fi Onkyo Integra audio only receiver at work and a Cambridge A3i amp in a bedroom system. The A3i is much better. I also do think the A3i sounds better than the A500.