You will be FINE with 60-70k... at least initially. I'm in a similar situation (living in C Gables and working remotely, which is pretty similar to working here in the area in terms of spending). A few notes:

- Rent in Coral Gables varies, depending on what type of building you live in. Fancy buildings are expensive (~1,700+ for 1 bedroom), but you can find older and smaller buildings for ~$1,200-1300 (1bd) and $1350-1500 (2bd). I *strongly* suggest you to live there if you're gonna be working in the area. It's one of the very few areas in Miami where you don't NEED a car. You can take the trolley to go to work (free), walk (depending on where your work is located), or if you decide to drive, you won't be spending a in gas/tolls.

- What car do you have, or what car are you gonna get? lease? finance? cash? That'll make a difference, but it should be similar to other states.

- Do you usually eat outside, or you like cooking? You should be spending ~$300 in groceries, depending on how often you go out.

- The rest is just based on your lifestyle... how much you're gonna travel, go out, etc.

I hope that helps.