Re: Mixing the oWoD and nWoD
From what I understood about when I tried to look through V:tR, they wanted to try and make all the old stuff possible to construct...but anyway, maybe not what you are looking for.
From nWoD, I loved their combat system and the way that Attributes are supposed to be handled. I liked the whole Application-Defense-Resistence angle to the three attributes for each category. I'm sure you can take that and apply that to oWoD (In case of Presence, just replace it with Appearance. Ta-Daa!) Of course, that would mean changing a few things, like the Nosferatu=0 appearance thing, no biggie.
I liked the rolling system in nWoD, as well.
From oWoD, in the instances of vampires, I'd keep the abilities, clans, and disciplines. Just replace relevant attributes needed for each discipline with the nWoD attributes.
But I have no experience mixing either, so I don't know how well it would work out.