My suggestion is that you find what town you wish to invest in and contact a local real estate office. Forget about hiring a super service to do it all for you and you take more control over the purchase.
A real estate agent can help you find a place to get a mortgage, but you want a property management company to manage your purchase, not a real estate agent.
You should interview real estate agents and property management companies, just as you would any other employee.
Personally, I am not too fond of Florida and all the humidity, bugs, alligators, and hurricanes and I am always a bit puzzled as to why the British are so attracted to it.
However, if you want Florida, the prices in Florida have taken a big drop, so it is a good time to be looking to buy something in Florida and to get a good bargain. If you find something you want to buy, offer them a lot less than they are asking and negotiate from there.
I see that prices in Las Vegas, Nevada, have taken a huge drop, so that is a place worth looking at in hopes of getting a bargain in a place where there is always going to be housing demand.
In the current market, I suggest that you stay away from pre-construction. Buy a place that is completely finished, so you can see exactly what you are getting.
San Diego, California, is a lot nicer place to live than anywhere in Florida. The weather is 1000 times better. Prices in San Diego have taken a large drop, so it is time to start keeping a watch on that market.
I am a big fan of investing in my own home state, Oregon. It's always been a healthy real estate market and a desirable place to live. Prices have not dropped, yet, but I am starting to see the occassional nice place at a decent price.
Seattle, Washington, is a very good place to invest (and there are direct flights from London to Seattle). Prices have not dropped. They have just continued to go up.