Well the classics are Pride, greed, envy, lust, rage(wrath), gluttony and sloth. And at least if your really into sloth, odds are you are not going to commit any of the rest. Our modern consumer society is built on envy and greed, so that's a lot of marketing types and business people going to hell.
Murder is bad, as it can never be reversed. Dead is dead, and once dead people don't get better.
Rape is horrible, so that's up there. Stupidity is self punishing, like gluttony.
I think that crossing picket lines and working as a strike breaker are right up there too.