I would drop the MaNs in favor of boosting the numbers of lootas and tank bustas. Use the third heavy support slot for the battle wagon and give it to the lootas to use.
Is there a way you can make a second unit of shoota boys? I would take them in favor of slugga boys, but if those are the models you have then that is what you will take.
As for the mega armored boss, go ahead and give him the boss pole, with his LD he will be a key in keeping a squad from running away. Plus in mega armor he will be good at accepting challenges as there is always that enemy character that wants to get into a fist fight.
I agree with OD, you need poles on all your nobs, I would say required kit, but that is me.
I look forward to your batrep and pictures. Go forth and krump!