Just for ur info, if ur going for HR5 quest n above SOLO, DONT use dual. Low attack power n no guard is one of the most important things when going solo (with friends, ok 2 use dual). Best bet is LS, GS or SnS. But still, its up 2 u. Anyway, back to topic. I reccomend:
Prototype Saw-Slicers
Guild Knight Sabers
High Twin Flames (Sad coz low green sharpness)