I have two questions. First, I have a Trane HP that's about 12 years old and is leaking freon. The service guy said I could replace the coil on the outside for about $1,200.

Second option is to replace the unit entirely with a new 3 ton Bryant Evolution 16 seer split unit, installed for $6,300 (price reflects $1,000 rebate from Bryant). I live in Florida. My air handler is pretty old and rusty and the outside unit is about at its max life from what I have read so I am inclined to replace but the price seems high and I don't know much about Bryant. I could get the 18 seer model for about $700 more.

Thoughts? Should I replace the coil and or cut my losses and go with Bryant or a more well known brand like Trane?

Thanks in advance!