Don't believe in making things easy for yourself, do you?
At this time, Lionheads are only an exhibition breed at ARBA shows. The colors that are currently part of the COD holder's current standard are Black, REW, and Tort. If and when the breed gets accepted as an official part of the ARBA standard (something that is still at least a couple of years away), there will still be several more years before BEW can be part of the standard. According to remarks made by the current BEW COD holder on the official Lionhead club website, she is having trouble coming up with show-quality BEW's herself. Sounds like you may be hoeing a tough row for a long time to me.
Your first move, though, should be to learn the breed standard, and learn what the words in the standard mean. Get someone who knows the breed inside out to show you what you are looking for (pictures don't really get the job done, you really have to get your hands on the animal and feel a lot of what is going on!) Learn to evaluate your own animals, know their strengths and weaknesses, so you can avoid breeding animals with the same faults together (all animals have faults; the perfect animal doesn't exist!) At some point, you have to learn to be color blind. Forget "pretty," what is going on with the hair and underneath the hair. When you can sell your favorite kit as a pet because type-wise, it just isn't good enough to be a breeding animal, you can consider yourself a serious breeder.