No, you read it backwards. The system is drawing 895W from the wall. An 80 Silver rating means the PSU is at least 88% efficient at 50% load, 85% at 100% load. Even assuming the PSU is at 100% load, which this one isn't, that means that 85% of the 895W, or 760W, is actually delivered to the computer ( Crash said as much on page 2. ) PSU wattage ratings are for what they can deliver, not the limit of what they can pull.
256GB is only a storage drive if you're very selective of what files you put on it. After Win7 64, StarCraft II, LotRO, Mass Effect, and a few other system apps and utilities, my 128GB M4 only has 40GB left. Would you consider 170 GB enough to store everything? Perhaps it's enough for more casual users, but what casual user wants or needs an SSD? Sure, your average user's collection of Word and Excel docs rarely amounts to even a gig. But power users and gaming enthusiasts store content like massive music libraries, picture galleries, digital video archives, optical disc images, file downloads ( game patches, demos, utilities, etc, ) and much more. My photo RAW files alone account for over 200GB. At the very least, a HDD can be used as a full backup data dump for the SSD.