Thank you all for your input! So sorry to just now be getting back to this, the Holiday's have had me running in all different directions. We ended up going with a 10' x 20' run enclosed on top and all sides attached to a 8' x 10' coop and it is working out great! I currently have 29 14 week olds in here, but about a dozen of those are Roosters so I will not be keeping all of them. When all is said and done I should have about 18 in this coop. We are so pleased with how this coop has turned out and is functioning, and the chickens are happy!
Thanks everyone again for your input, and I like hearing about everyone else's coop building experiences!