My experience with ORMs has been that I eventually end up regretting using one if I try to model my data as objects because with ORMs it's easy to code yourself into a corner where you end up wishing that your design supported the relational model instead.
I do understand the desire for a good ORM, though. SQL is extremely powerful and a well-designed database is a joy to work with, but a sequence of tuples is often not the most convenient datastructure to process in most programming languages.
And that's fine, but it does mean that you should pick an ORM that plays nicely with that workflow (or otherwise design your ORM to be compatible with it). Back when I was working with Perl I found that you could do some pretty good stuff with RoseDB -- it could load objects from your custom queries and they'd still work like normal ORM objects (i.e. you can load related objects from them). I've missed that capability on several occasions since.