It is a good idea to go above 4k, i would say that 64k is my best congfiguration. But i do alot of gamming, and cpu intensive programing. So when i do alot of queries the 64k clusters help speed up anything that hdd intensive. So if your a gamer the odds are you want the same configuration. If you dont game or doing anyting hdd intensive then your just better off with 4k.
It seems that every time I reboot my wallet get smaller.