What type of smartphone "alternative" do you think you might try? Assuming money wasn't a concern, just form-factor.

The types that I know of that already exist:
Smartwatch
Google Glass
Cicrit bracelet http://cicret.com/wordpress/

Any other concept, however expensive or theoretical it might be.

I like the bracelet. I wear a watch all of the time anyway, so swapping out my watch for a bracelet wouldn't bother me.

I wear glasses already, so a more streamlined Google Glass would be interesting (without the real-time video recording), but I wouldn't want the AR experience all of the time, I don't think.