I see you've tried a lot of things, but how long have you tried any of them? My daughter is stubborn, um I mean persistant, and we've had our battles over lots of things including sleep. For some kids it takes a long time to settle into that falling asleep on their own, in their own space thing. It just does. Our daughter never slept in a crib. We own one, she just never slept in it. We co-slept until 1 year when none of us were getting any sleep because we're all bed hogs. At that time we tried the crib and it was a disaster, so I just gave her the guest bed which happed to be a queen sized futon on a fairly low platform. I actually had to sleep with her for a month to help with the transition. Then I would stay with her until she fell asleep. Then I'd just stay long enough to nurse a bit and read her a story. At 18 months she suddenly self-weaned and she was happy with stories and songs generally. She's 4 now and we still have occassional struggles that can last up to 3 weeks where we just have to keep returning to her to bed and reminding her that we've completed the "story, book, and song" part of the night and now she needs to go to sleep. Oh she'll cry and yell and stomp her feet, but in the end all will be calm again. So, all I can recommend is that you choose a strategy and stick it out for a month or so with as few changes as possible. Make it as easy on the three of you as possible and just just go with it. Use whatever strategy is appealing, but STICK IT OUT! Good luck!
M.