There are two types of PCOS - insulin-resistant and non-insulin-resistant. If you are insulin-resistant, eating a low carb diet helps with symptoms. The other type is more difficult to pinpoint the underlying cause.

http://thepcosfactor.blogspot.com/2010/07/know-your-pcos.html?m=1

I'm not really aware of 'types' per se, but it does seem to be the case that there are a number of things that could underlie PCOS, and that's why treatments don't work for everyone. There are a few things that you should definitely find out about that will help you figure out what is most likely to help you:

1. Are you insulin resistant? Your doctor will need to test for this.
2. Along the same line, there is a blood test called hbA1C that can give a pretty accurate picture of your risk for prediabetes/diabetes
3. You need to be tested for thyroid dysfunction. Some people have both thyroid dysfunction AND PCOS, but some people seem to be misdiagnosed with PCOS when actually their thyroid is the problem.
4. Are you overweight? Most people with PCOS are, but some are not (like me). Treatments like metformin do not always work as well in people with PCOS who are not overweight, but they don't really seem to know why....might be related to the insulin again.

So, while there might not be recognized 'types', you need to have a clear picture of what is dysfunctional in your body (and what you can rule out). If your case is mild, you might be able to avoid meds, which is great! Have you tried a low GI diet? Still, don't neglect finding out about your risks for cardiovascular disease, diabetes, and endometrial cancer just because your symptoms are mild....make sure you get checked out!