FAULTY DICE

I have a month until doubles tournament, my doubles partner is taking autocannon heavy guard with the plan of sitting ang shooting the gak out of everything. I will be taking orks... this is the list
HQ
Warboss bike power klaw attack squig cybork
150pts

troops
5 nob bikers painboy waagh banner power klaw 3 big choppas boss pole cybork
340pts

19 boys (slugga or shoota undetermined) nob power klaw boss pole big shoota
159pts

fast attack
2 deffkoptas, 2 rokkits, buzzsaw
115pts

Heavy support
battlewagon deffrolla
110pts

comes to 874pts
5 kill points

OR

HQ
Warboss bike power klaw attack squig cybork
150pts

troops
5 nob bikers painboy waagh banner power klaw 3 big choppas boss pole cybork
340pts

19 boys (slugga or shoota undetermined) nob power klaw boss pole
154pts

fast attack
3 warbuggies rokkits tracks
120pts

Heavy support
battlewagon
deffrolla
110pts

comes to 874pts
5 kill points

Ok thats one of the problems... koptas or buggies, i cant make up my mind... if i take the buggies i can give the battlewagon a 4+coversave and pop transports on the way forward...if i take the koptas i can tie up devastators in the first turn or pop transports first turn awesome disruption.

My other difficult decision is slugga or shootas... 19 shootas in a battlewagon is some awesome drive by potential but is it worth dropping the extra close combat attacks?

The last confusion is whether to try and swap the battlewagon for 2 trukks full of boys... an extra troop slot yes and slightly more boys BUT no where near as survivable as the battlewagon.... what to do
HELP!!!