5K budget Integrate amp may be waste your CM 5 wor. I don't think RA-06 can push CM 5 well. In 5K price range, may be you can wait marantz PM-8004 which will be coming soon.
Searched several posts, 5K amp may not push cm5 well. Most Ching said that 10k+ amp would be better. Anyway, I will try rc-06 first. If it is okee, buy it for temporary use.
CM5 is my favorite speakers so far as I prevent to listen CM7 or series 800... haha.