What did you end up getting? My GNex is showing its age and am wondering what Asurion is sending out to replace these now.
The first time, they sent me a refurbished GNex 32GB. The screen was washed out, so I requested they send me a new phone. They were out of refurbs at that point, so I ended up getting a new LG Spectrum II. It's a pretty descent phone, but it comes with a lot of bloatware and LG's stupid overlay. I rooted it and removed the bloatware, but am stuck with the overlay because there isn't much support for custom ROMs for this particular device.
Performance wise, this thing blows away my GNex... In fact, it out performs a friend of mine's Nexus 4. One other point of interested is that the LG actually gets a 4G connection. I had my Gnex for over a year, and it RARELY would connect to 4G. The radios in the Gnex suck in comparison.
Good Luck!