Cardo JBL 45mm or whatever size fits your helmet. They have a regular 3.5mm plug so you can use an extension lead to plug them right into your GPS, if it has a headphone jack, and never have to worry about batteries.
If you do want an actual Bluetooth system, then Cardo Spirit HD. Rode with it all last year, does a fine job as a single-rider system to connect to my phone. I am sure the equivalent Sena is also perfectly fine.
EDIT: Oh yeah - don't underestimate the advantage of voice control, even if you are riding alone. Skipping tracks, navigating to the nearest gas station, etc. - all done in your helmet, hands-off.
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