I'm a little late to this discussion, but I wanted to chime in because I have had a very positive experience with Lamictal. I feel good (knock wood) for the first time in years. I am much, much more patient; much more clear-headed; better able to take that brief second before reacting that allows me to feel I'm making decisions, not just letting my thoughts and actions "happen" to me. Before I started it, I was in a wicked patch of dysphoric mania, and the Lamictal has really helped with that. I also think it's helped with my migraines. I feel like I have energy but that I can choose how to expend it. As to the rash, it's really not that big a deal. Even if it turns up, it progresses slowly and is quickly reversible.
I hope you are feeling better whatever decision you come to on this point.