I'll be getting a black one ASAP because my Gnex dies after 2-1/2 hours of talk time OR 1-1/2 hours of screen time. I am swapping batteries three times a day.
But when Motomaker becomes available, my wife will be getting a customized one and I might do so as well as we will both be eligible for upgrades at that time and I really, really would like a crimson one (to vainly match my car).
For both of us, 16GB is just fine. We have a certain amount of music, she is not a heavy app user and I am very selective with the apps I have loaded. She isn't too good at offloading her pics whereas I do so at least bi-weekly but even then, she has plenty of room to spare. And I've barely used 6GB for music, apps and pics/video I haven't offloaded at the moment.