Quote Originally Posted by Elpizo
Excalibur+Masamune is quite good, if you ask me.
I'd go with what Elpizo said. In fact, I did go with those 2 out of 3 when I played through FFV. They are well over 200+ in the attack power column when equiped with the 2 handed ability. Then for the thrid weapon, just pick whatever you need for the other job class you use the most. You will eventually get them all, so don't worry.