I seriously wouldn't pay an extra 10 cents for CAT6 unless I was wiring a datacenter. CAT6 used to be more sensitive to sharp bends and kinks than CAT5e, though I don't know if this is still the case. 1000BASE-T (Gigabit) works fine over CAT5e, and it's going to be many years until 10Gb equipment intended for consumer use becomes widely available. Gigabit is still not predominant, and how do you even fill a Gigabit pipe in home use? At work, I push about 900mbps between two servers with RAID5 arrays. I have yet to push any other traffic past 280mbps. 1gbps holds over 100 compressed HD streams, for pete's sake! It's going to be eons until gigabit connections are available to even 5% of homes in America--why, most telcos and cable cos don't even allocate 1gbps for Internet traffic on their trunks into small and medium-sized towns, let alone individual subscribers!