1) Custom ROMs are rooted, so why did you root the stock ROM, when you're not going to be using it? (It's the ROM that's rooted, not the phone itself.)
2) What do you want the custom ROM to do that the stock ROM doesn't? Looking for "a custom ROM" is like looking for "a book". If you have nothing specific in mind, the stock ROM will give you the same thing a custom ROM will. The reason for running custom ROMs is to get the thing(s) the custom ROM gives you that the stock one doesn't.
So you have to decide what functions you want that the stock ROM doesn't have, before anyone can point you to a ROM that meets your needs. And everyone's needs are different. A custom ROM that, for example, played music much better, but didn't support GPS, would be useless to me. I don't listen to music on my phone but I need the GPS. For you, that might be the ideal ROM because you listen to music all the time and never use the GPS.