Which sheep to rule them all...?

I've set my sight on trying to built an aggressive healer/sheep probably similar to Lu Bu's Sheep of Pain. Now I've been really lucky to pull several gennys to actually make a +10 but would like some advice which one I should invest in.
Unfortunately, no +spd, though...

Possible IVs:
+Hp/-Def
+Hp/-Atk
+Atk/-Hp
+Atk/-Res
-Atk/+Res
+Def/-Res
-Def/+Res
-Sp/+Res

Any help is much appreciated!