Thank you all for your responses earlier related to my concerns over installing undersized equipment. I think I am going to go with the smaller 2 ton condensor and see if I can make any improvements to the existing ductwork without tearing the house apart. It also seems like 15 SEER vs 16 might make more sense as well.
I am meeting with my installer tomorrow to go over the manual J-sizing but don't know much about the calculation except that it tells me what size cooling and heating system I should be running.
Are they any questions I should be asking him when I go over the calc (I know this seems silly to some but I don't know much about HVAC)?
Also I heard the systems need to match in output (i.e. if I have a 2 ton condensor but the furnance is 3 ton is that a problem)?