The H67 is suited for an Office system as things are now..
But remember, more and more people are getting SSD's. I've even installed SSD's in our Office computers, where I work. So the world will slowly move over to SSD's. More and more.
Z68 brings a 'hybrid', namely to use SSD as caching for Harddrives. This can greatly benefit the performance, while at the same time being much cheaper VS using bigger SSD's. So in time, I think H67 will be phased out and the Z68 will take over it's position.