For pure leveling, if you're soloing...
I've always thought Crit Katar builds were most useful
Such as a frozen katar with
High Str
About 150-170 Dex
Enough Agi to Max Aspd
About 50-150 Vit
And Moderate Luck for Decent Crit
Then you just go to thor_dun03 or such and fight against the elements
And if salamanders are too much go to 01 and fight kasa mobs
Also if you don't want to add luck you can get crit rings, etc...
For pvp, Most go SB if you have the kiels and equips
If not most will go Double Dagger/Dagger + Shield combo
Which usually involves mainly TG's, Incant, Phreeoni, Goldenring, Hydras, Etc...
But for those builds it's essentially the same..
Just aim for really high str, enough dex for instant cast, enough agi for max aspd, then the rest in vit