The wired ports are 10/100, not gigabit. So category 5 on up will be fine. Cat 6 is pretty good all around for everything up to and including 10Gbase (10 gigabit), however it can be troublesome at those speeds over long distance...
Not a problem you are likely to encounter in home networking.
cat 5 and cat6 both had working range of 100 meters (which means approx 330 feet).
So if we consider distance then it won't affect much. However it's true that cat6 is better in performance as compare to cat5 which is why it's almost 20-30 % more expensive than traditional cat5e..but the performance is mostly in speeds so if you are not dealing with speed in Gb/s (which you won't) then there is no need to spend extra cash on cat6.
So go with cat5 for now. For more info on cat 5 http://receivetipstricks.com/cat5-ethernet-cable/
hey man mmm ive brought a ethernet cat 6 cable and wondering if ill still get the same internet speed im im right next to it with the cable and if im 8 meters away. my computer is 8m away from my router and im asking if im going to experience internet problems.my internet speed is 76 mb. thx man