I am on 4 MG of Folic Acid. I am at higher risk as I had an anencephalic fetus years ago (before I knew anything about the meds, etc). I am still a faitly small risk.
I would not worry about passing it on. Most epilepsy is idiopathic anyway. I know several folks with epilepsy who have had several children - all fine. As a mater of fact, the only thing abnormal was a case of cleft palate and one boy born with two different colored eyes. In other words, absolutley nothing to do with seizure disorders or the meds!
My husband and I were sent to a genetics counselor and were told we would be seen by a high risk specialist, purely as a precaution. In fact, it was primarily for my benfit as the hormones can play a litle havoc with your levels. They did tell us that the baby would probably be kept on anticonvulsant therapy for first year, just to be extra careful.
I say go for it and good luck. Baby cheeks are the best thing to kiss, eh?