I have put resin heads on vinyl bodies- so has greyhaunt and kikichan.
Here is a shinydoll resin head on a 50 cm Obitsu body. I think the Dai head would look great on an Obitsu 60 cm body and you can't beat the way they pose. I had my elfdoll Red head on a 60 cm Obitsu body for a while but didn't like it much (because he's a boy and the body just wasn't manly enough for him). What I did was take the resin hands and use those instead of the vinyl ones. Zirconmermaid came up with the way to do it, maybe she will post it here. It worked out very well and if my Red had been a girl I would have kept that Obitsu 60 body.