Why is epic necessary? To my mind that removes a number of superb series which might not meet that particular requirement. There's a lot of stuff mentioned in this thread which I wouldn't wish upon my worst enemy, but that's the joy of reading - you might love what I find boring, repetitive and...frankly, rubbish
In the interest of impartiality, I'll leave that up to you though.
There are some amazing suggestions though, so I strongly suggest going out and buying four or five books - each of which is the first in a series by a particular author. Then you can decide whether you want to splash out on more (it's how I do it every six months or so):
A Song of Fire and Ice by George R R Martin (intricate and I found it very emotive)
Wheel of Time - Robert Jordan (This is one of my "bleh" options, but it's popular - to be fair, I loved the first five or so)
The Dark Elf Trilogy - R A Salvatore (very accessible - swashbuckling!)
Riftwar Saga by Raymond Feist (start with Magician - then there's loads more)
Legend by David Gemmell (not part of a series, but he's written plenty and he's one of my favourites)
Temeraire by Naomi Novik (a bit different from the others, but superb)