best sword i got was "Claymore of Snow". Did 81-134 damage and had Frost(3)
and Charm Quality of 5 (and so i added 5 large charms to it which means it's one crazy sword). Not sure where i got it exactly, i think i either bought it from the smith or got it randomly in a cave. Only bad part of it, it's 2 handed = no shield. But i'm still trying to reload-ID to get a good holy sword that beats it..no luck yet. Holy sword seems to do 71-100 damage max and rarely gets a Frost on it, but it's one handed.
anyway seems 2 handed and 1 handed swords are equally fast, so you don't loose speed if you use a 2 handed sword and usually do more damage with it.