If Pluto was still a planet by definition, there would be 10+ other planet in our system. Planets are supposed to have something special , they aren't just small rocks floating around. If it was so, one could consider large asteroids as planets too. But that's another debate in the same line as the tomato debate...

I did not considered putting a gas giant close to the star mainly because our solar system don't have one... Maybe they can't form too close but I'm not sure. How close could it be? One could say that considered the size of the system, Jupiter is pretty close to the Sun.