If you have a specific address or home in mind you can just go here:
Sarasota County Tax Collector and see what they are currently paying for taxes.
Insurance is not quite as easy but I can give you a few tips on things that insurance companies look at:
age of home
style of roof- i.e hip, gable, mansard, etc. Hip is generally the best and gable is usually the worst.
How close you are to a fire hydrant or natural body of water
if you are in a flood zone and what the zone is
I have a home built in 2003, 2100 sq ft under air, hip roof, less than 1000 ft from a fire hydrant and I am not in a flood zone. My insurance is just over $700 per year through Olympus. I live in North Port (south Sarasota county).
A few websites that might be helpful are
My Safe Florida Home This is a website through the state of Florida that talks about wind inspections. If you get a wind inspection done on your home and turn it in the your insurance company you can reduce your home owner's insurance-and sometimes by a great deal. I got mine done when they were still giving grants to have this done, so it was free. It is my understanding that it costs are $200 to have this done.
Another website that might be interesting to look at is:
Compare Homeowner's Insurance Rates
Good luck with your search!