The easiest choices are:

Mathew, Carly and Rory. You need the food, you need someone to navigate, and the nurse is better than the nervous, addict doctor.

The remaining 6 are more difficult.

I'm assuming we'd all eventually get home.

I'd take the crippled boy, he's just a child. Everyone could take shifts in caring for him, unless someone decides to be the main caregiver.
I'd take at least Amy, so that her children will not be orphans.
Probably Richard to keep up morale and for his courage and his skills.
One of the holy people, probably the nun. So I wouldn't go to hell for leaving them both to die. :P

That would leave spots for 2.

I'd hate to split up the other couple as well, but it'd be between Mary, Jimmy, Dom, and Russ.

Jimmy, is more useful with the pharmaceutical training, so I'd leave Mary behind. They have no children.

Then it's between Dom and Russ. I'd make them draw rocks. :P Or fight to the death.
If anything, the nun should be willing to give up her spot for someone else. So maybe I'd swap her out and include both of them.

Curtis, who are you not taking on the boat? :P