Iv installed plenty of CAT6 in my days, EVen as far back as 2 years ago when it was first released. Gigabit in the average residence is just an over sell. Kinda like installing 12x2 monster cable for there distributed audio system.

Unless your dealing with a geek who know what he wants, and understands that the hardware is gonna cost more than his whole house is worth, than go for it.

There is no right or wrong answer, just preference, and standards.