Standard Cat6 is not that much more expensive than Cat5e and has the extra headroom for go up to 10 gbps later on (I'm thinking like 30+ years ahead type of thing). While Cat6A or 'Cat7' would be literally triple the cost for the same amount (I'm not kidding at all I was able to get 1000 feet for about $150 and my buddy who gets pricing through AT&T gets Cat6A at $450 for 1000 feet). Your standard household probably doesn't have a need for over 1, but considering MY network is actually being designed for in home media streaming, VPNing and a development network on the side etc., yes I actually can utilize 10 in the future if it becomes standard.
That said, its hard to predict what the future may hold even for a standard consumer need in a standard household, and for a minimal cost increase on Cat6, I would just go ahead and use it. The installation isn't that difficult (punch down and crimp on Cat6 certified RJ45 plugs and connectors is really quick, no different than Cat5e to Cat5e connectors) and you are covered in case a need does arise later. Achieving the proper distance for full speeds isn't really that hard either, very few homes are going to have 150 to 200+ feet runs where you would actually lose speed if conditions are not right. Even in my long ass house I only have one run that goes over 150, and its only by 15 feet.