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I am gonna look into the Cardo and Sena units.
Am I going to need a special helmet or will any of these attach to a regular fullface?
While you can buy a helmet with these devices integrated your options are very limited and I wouldn't recommend going that route. Basically, all the models you will see from either Cardo or Sena will attach to almost any helmet and will come with all the different bits needed to customize the fit.
I picked up this unit with a pile accessories today. It is an older system but the price was right ($0).
I will set it up and see how well it works for me. It seems to have all the features I want even if it doesn't have the latest tech