Some help with my sin

Alright, I have a level 79 trapsin, with decent gear. I am wondering where to put the rest of my skill points because in 2 levels everything will be maxed for synergies, and I was thinking maybe more into burst of speed.
Her Gear:
Dual Bartuc's Cutthroat
Sazabi's Helm
Topaz'd Shaftstop
IK Belt
Natalya's boots
Dwarfstar
Frosties
Bahamut's Ring (+103 mana)
Raven Torc
+1 traps
+11 energy
+13 resist all
damage reduced by 2
8%damage taken goes to mana
20% MF

Stats with gear:
Str:190
Dex:150
Vit:225
Energy:36
Mana: 362
Life: 961

Lightning Sentry Damage: 1-3964

I'm fairly poor, but are there any suggestions on skill points or stat points or gear? Please give input. Thanks.