In my opinion, GNex is by no means a bad phone, but if you're not a ROM maniac, choosing it today is somewhat pointless, especially when compared to your Bionic (Bionic uses OMAP4430 while GNex uses OMAP4460, not much of a difference).
Why not the Verizon Moto G anyway? Also $100, not much better specs, but longer supported (support for GNex is already discontinued)
Sent from Motorola Photon Q 4G LTE @ CM11
Google Nexus 4 (CM11 Nightly)
Motorola Photon Q 4G LTE (CM11 Nightly)
Samsung Galaxy Nexus (CM11 Nightly)
HTC Incredible S (CM10.1 Unofficial)