I'm bipolar 2 and have 2 kids. I had one before I knew I was bipolar and one after. I never once considered the fact that I have bipolar a reason not to have kids. This is just me and it may sound selfish to you, but I refuse to allow this disease to control my life and decisions anymore than it already does. It is enough that I have spent at least 95% of the last 16 years in a mild to severe depression (the hypomanic episodes are very very mild and of very little concern to me or my doctor).
I think of bipolar as just another incurable yet controllable disease and is not a death sentence. Not that many people sit down and think - I have a history of diabetes or heart problems or Alzheimer’s disease in my family so I shouldn't have children. Just because you have the disease doesn’t mean that your kids will, remember they have a lot of their dad in them too. If they do end up with the disease there is no better person to know the signs to look for and to get them help to control their disease a lot sooner than most people.
I'm not trying to tell you that you are wrong to decide not to have kids. To tell you the truth I didn’t want kids before I had them (oopsies happen). I just want to give you a different perspective. Bipolar isn't the only thing that can be passed on. If we all worried that we could pass something unpleasant onto our kids then there would be a lot fewer children in the world. When making your decision remember that having kids is a crapshoot no matter how you decide to play it, but the prizes can be amazing.