[dvas]

I also advocate the full face helmets. Plus, open face helmets look a bit silly to me.

First thing I would suggest you take a look at is the helmets rating. Make sure it is snell SA rated - most mainstream helmets should be. I assume you'll be tracking, so also ensure the date is adequate as many organizations will not allow older helmets. Be wary that even new helmets are sometimes sold at discount but because of an old production date.

Beyond the rating system, fit and creature comforts come next. Fit is a personal thing and creature comforts generally correlate with helmet costs.

I would add Bell and Arai to your list. I'm a big fan of Arai's because of the fit and quality and am currently on my third model.