It should be "of a resting place". It just sounds weird otherwise...
Not sure if regionalism has anything to do with this. "That's a strange choice of profession!" "What a lovely shade of pink/rose/green etc!" "He's a despicable kind of thief!" For me, no article is necessary for those to sound normal. Likewise "It's a rather morbid choice of resting place."
"I'm good" is a saying we all use... a lot.
I never say it. "I'm fine, thanks" is what I use, along with some other phrases. As far as the movie dialog, don't know what I'd say.