I believe Paul is giving you good information. I did a lot of reading, and talked with some very solar- knowledgeable people before installing our system, and learned that the output of individual solar panels should be as close to the same as possible, whether they're wired together in series or parallel. That isn't to say they won't work if they're not the same, but the lower output panel(s) will, essentially, reduce the output of the higher output panel to that of the lower output panels (Did I say that clearly?)
Basically, using panels with different outputs means you'd be wasting, roof space, power and, perhaps, money.
Kev