I was in the exact same boat as you 5 months ago. Upgrade was due 5 months ago, so I started shopping and waiting for new phones, Waited on CES also to see what was on the horizon as I was satisfied with my BB for the time being. Also started lurking the forums to do as much research and to get as much info on each phone as I could. SOOO, BB owner, new to Android, stuck between the Gnex, Rezound, and Razr (RazrMaxx because I waited).
After weighing all the pros and cons of all the devices listed above and scouting what was coming up in the next couple of months I decided to go with the RazrMaxx for me and my wife.
While all 3 are pretty much on the same level with each other, the RazrMaxx stuck out for a couple of reasons. One was that huge battery, coming from a BB, I was kinda spoiled not having to worry about battery life and getting a decent runtime with my phone. The Gnex has an extended battery but the cost of 300 more Mah versus the benefits was ridiculous. The Rezound also has and extended battery that made the phone a huge piece of equipment compared to the other 2, add a case to that and you have a literal mini brick in your hands. Second was the SD card slot. I have one and use it on my BB, as do you, I assume. Its convenient and upgradeable and stores a lot of info/music you can move to another phone quickly and easily, provided the other phone has an SD card slot. Third is the location of the headphone jack and the notification light. I do not like the placement of these on the Gnex (they are at the bottom of the phone), I put my phone in the cupholder a lot and listen to music from my phone so this would not work. The notification light placement on the Gnex seemed kind of stupid anyways, but that is my opinion.
The Rezound quickly fell out of the running just based on the fact that I knew I would want a bigger battery and HTC's battery was bulk that I did not want to add to the phone. I'm not too concerned with bulk or "Thinness" but I would like to keep "pocketability" with all my phones. Although the Beats headphones included is added value, for those of you keeping tabs.
This leaves the RazrMaxx and the Gnex. I was initially going to go with the Gnex based off of specs alone. It is a great phone on paper and easily has one of the best screens I have ever seen. 3 of my friends also purchased the Gnex shortly after release and all 3 of them love it, no problems or issues with it what so ever. They did not have any of the issues with it that many were having in the Gnex forums ie: Reception, 3g to 4g switch, speaker quality/sounds being loud, and bugs in ICS. Although there are fixes for most of the issues available in the market and through a custom ROM, I believe the phone has to function properly out of the box and not rely on third party fixes to restore something that should have been there from the beginning (Just my personal belief, especially if I'm going to spend 300 on a phone). There were just TOO many folks complaining about these same things on the boards, too many, and I did not want to take the chance that I would be one of them.
- The Gnex has ICS ---- The RazrMaxx will get ICS, after all the bugs have been worked out, hopefully.
- The Gnex has the huge, really nice screen ---- RazrMaxx has a big screen and not as much PPI, but coming from a BB, ANYTHING is better at this point.
- The Gnex is super customizable ---- Got me on this one, with Moto's locked bootloader and all, but with me being a nub at Android and hacking/ROMS, I don't want to really take a chance at voiding my warranty and screwing up my phone. Although an unlocked/Dev version of the Razr is being released by Moto, so there is some hope for developers and future customizers of this phone...
- The RazrMaxx does NOT have a removable battery ---- Was worried about this until I found out that a hard reset can be performed and in case of a battery failure, everything is on the SD card and the cloud and I have the extended warranty.
- The RazrMaxx and Moto have some of the best accessories around for their phones, the HD dock and the car dock come to mind. Where are those for the Gnex?
I am in no way bashing the Gnex or the Rezound, both are great phones, both just didn't stack up in my comparisons with the RazrMaxx and with what I wanted/needed in a phone/device. Although I will surely miss a lot of the things my BB does so well (BBM, E-mail, and the keyboard) it is time to move on. With me being almost in the same situation as you, hopefully my research and findings will help you out in your choice. Sorry for the long post, just trying to help, Good luck!
-Phil
*edit --- I do own the RazrMaxx, it is quite nice!