I have a FF, a 3/4 and a Modular.. They all have their charms.. I usually use a FF Dual sport lid these days - more for the peak, which is awesome when it comes to blocking the sun (think baseball cap).. I find a peak much more useful than a visor, though the drop-down visor in my Modular is pretty-nice too.
Just decide what you want out of a lid and go try some on..
I know the fashion is to buy online these days, but - and especially with the more economically priced lids - if they don't fit right - they are likely going to be uncomfortable after a while, and to a point where you will eventually stop wearing it. Going to a store they can usually measure you, and help you choose the better helmet for the type of riding you do, as well. Certain brands of helmets fit different shaped heads better - some helmets are designed to be more aerodynamic in certain riding positions (for example)..
Prize comfort over protection. They'll all protect to roughly the same degree..
Mostly it will come down to fit and good ventilation.
You tend to pay bigger bucks for "as good protection" with a lighter weight. Or better venting. Or lower noise. Or better aerodynamics etc..
If you must shop online, try Revzilla. They almost expect you to return a product - free - super nice about it too. I spent ten minutes just talking bike with a guy down there during a return one time - pretty-much at his insistence!
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