I think using the Glo brand makes a lot of sense. Keep Touch for the budget end, Glo for the high-end 6" market, and Aura for the large size 6.8" (or maybe a little larger someday?

) market.
I always thought calling the Aura the Aura when you already had the Aura HD was a mistake.
Looks pretty nice, but despite the higher resolution if my Aura HD ever bites the dust I'll be getting a H2O. For me, the form factor is perfect.