I just had my a/c unit freeze up for the second time in a couple months. I'm in south Florida and its getting hot so need to get this done soon. Had a guy come out and check it out and I have a leak in the outside unit. He filled it up for me for now, but we don't know how long it will last...now for the questions...I have a 3.5 ton 10 seer unit from 1994. The a/c guy quoted me a couple prices on 2 Rheem units both 4 ton, 14 or 15 seer $2900 and $3250 respectively and 2 Bryant units first a 14 seer 4 ton inside unit and 3.5 ton outside for $3200 and 15.5 seer for $3650. All with new R-410a freon. Not a huge price difference between the four units, but are these good units(brands)? or should I look into other brands, sizes? Oh yeah out home is just under 1500 sq ft. If i'm leaving something out i'm sorry just let me know...Thank for the help.