Like Jensgram already notes, it is hard to tell which option suites your needs.
That said, I have experience with Kohanaphp and it's integrated ORM. I must say it works perfect, but it has limited functionality if you compare it to Doctrine2. If you need advanced options like inheritance mapping and proxy classes Doctrine is the way to go. Like Doctrine 2 introduction says:
Object relational mapper (ORM) for PHP
that sits on top of a powerful
database abstraction layer (DBAL). One
of its key features is the option to
write database queries in a
proprietary object oriented SQL
dialect called Doctrine Query Language
(DQL), inspired by Hibernates HQL.
This provides developers with a
powerful alternative to SQL that
maintains flexibility without
requiring unnecessary code
duplication.
As it says, it is inspired on Hibernate HQL. I don't have experience with the other options you mention, so I can't say anything usefull about those.