Hi D.,
I think this initially started as a reaction to changes all at once. Our little guys can be such momma's boys :)
His power struggles are probably jsut his age... how can they be so cute, and be such monsters in the same 5 minute span?
I feel for you mom... you have to be sooooo tired :-(
If it were my guy, i would keep the crib and bed in his room and let him choose for now. put a gate up at his door if he's a danger to himself by escaping into the rest of the house while you're sleeping. my guy still clearly needs a nap, even if it's just an hour or two... I don't think 2 is the age where they drop a nap... i thought it was like 3-4 typically. but i can't remember what my two older ones did.
i bet if he starts taking that nap again, he'll start sleeping better at night. I think Dr. Sears' website has good info on sleeping. here's the home page: http://www.askdrsears.com/
For me, it was really important that my son didn't associate changes with the arrival of his baby sister (now 2 months old). So far so good...
It's tough being mom's only big boy, and then suddenly becoming a big brother and having to share mom.
Good luck, I hope the website helps.