A really good price for a power supply from Corsair with platinum rating and 850W, supporting single rail and multi rails as well.
The HX850 currently costs around $240 to $300 at Ebay/Amazon/Scorptec.
Note: It just happened that I needed a power supply and bought this one C&C. I've been reading only good things about RM or RMx models but given that the HX850 is more premium than RM850x which usually costs around this price range, I guess this could be a steal.
Thats actually a really good price considering the sh*t show thats been going on with the pc parts market. I paid ~200 for an RM850x at the end of last year and I thought that was a good price.