Just to put in my 2 cents... for my 920 sq ft house, I was told to use a 1.5 ton. So I think a 2 ton for 200+ sq ft is just too small.
I was wanting to go with a High velocity Conditioning System
system, but it is going at $7k per ton! That's about $8k per ton past my affordability
I liked it becuase it is installed with 2" venting in the ceiling, which to me makes better sense than using the floor ducts as heat rises/cold drops. It is also supposed to be much better at removing moisture form the air, as well as reduce the chance of hot/cold spots becuase it circulates the air in the house much better.
*edit" *sigh* I need a spell checker