i bought this house 12 years ago, has a trane weathertron 3 ton unit, was 3 yrs old then, now is 15 yrs old, and inside unit leaking, i'm gonna change out whole unit, current unit is a 12 seer -- any a/c guys out there ??? im looking at a ruud unit and a goodman -- both 3 ton 13 seer -- any suggestions ????