I'm a lvl 66 blade and my build is:
xx str
40 sta
70 dex
With a lvl 50~70 FS/RM at greemong and max berserk, 2 dretra's i have 100% aspd and hit like 1~1,9K dmg
I have a nice balance between dmg/blockrate/critrate(9% without buffs i think) and high aspd so i recommend this build, dunno if 10 more dex is worth the points...
One tip: when you hit 60 go gianting and sell alot so you can afford dretras