The GPS issue has been fixed for most, possibly all users already. Touch problems may be fixed as well - an update was just released that addresses it, so we'll have to see if anyone is reporting any issues in a week or so. Most people aren't having the random reboot issue, and personally I'd exchange your device if you get one that does random reboots. I've had my N7 since the first day or two it was released. I've had zero random reboots. I had the GPS issue, but it was fixed with an earlier update. I might have had *slight* touch responsiveness issues since the last update, but they should be fixed with the update installed this morning.
These issues would be the same across all 3 models (16g, 32g, LTE), so if you're worried about these things, I'd just be ready to check the device out thoroughly when you first get it so you can exchange it if needed.