Question about Audioengine speakers... A2 or A5+?

So I asked this in Audioengineering, but thought maybe this would be a better place to ask. So anyways... I'm having some trouble deciding on what speakers to buy. The Audioengine A2's or the A5+'s. They would be for music purposes, and I would use them in my bedroom. My room is about 12' x 15'. I'm just afraid if I buy the A5+ they might be too big, and won't have the room to develop a proper sound. What do you think?

Thanks.