I'd actually recommend starting here:
http://wiki.project1999.com/Guilds:Guild_List
That page has a great summary of every guild on the server, along with links to each of their forum threads, so you can find a few good possible candidates and then follow the links to learn more about them. Honestly I'd expect that most guilds on their except the "Top Content" ones help their members get epics.
Personally I'd recommend Anonymous as one guild you should check out. We do "epic nights" (where the whole guild goes from one person's kill target to the next's, helping everyone get their epics done) fairly often, and I just got my Druid epic not too long ago with their help, so I can say for certain it's a great guild for getting your epic. It's also a great guild for many other things too: thanks to our size and our alliance we raid a lot of stuff by ourselves, and then join up with our alliance, AEGIS, to do even harder stuff.