Hello, I live in Melbourne...nice little drive from our airport to PC...but you'll have to get lucky in the rates as only Delta flies and pretty much you will have to switch planes in Atlanta unless you are lucky to grab a flight that just stops in Atlanta.
As far as Tampa--it is 2 and a half hours from my house (about 35 minutes from the port) to my in-laws house in Tampa. Granted...I would guess the travel distance closer to 2 hours as traffic when you get into Orlando can be a pain. The best route is to hop onto 417 to get to 528, but that is right at WDW and congestion is likely.
I think MCO, if you can get your desired rates, is your best bet!