Having used the PlayBook I wouldn't go for the Nexus 7 - the PlayBook OS is just that much better than Android, and it's going to improve further with BB10. The thing that really appeals to me about the Nexus 7 is not for myself, but for my GF's mom who wants a tablet but is quite ill and can't handle something that's very heavy. The 340g paired with $200 price point is really the selling point, but for me the weight is a non-issue.
It definitely kills the Kindle Fire though, Amazon's going to have to see if they want to do a price drop to $180 or not.
The word 'Pentaband' means '5 Bands', from the Greek word 'pente' meaning '5'. For a phone to be pentaband it has to support 5 bands. If the phone has AWS support, it doesn't automatically mean that it is pentaband. The reason Wind and Mobilicity users like pentaband phones is because the reverse is true. We're not the only ones who like pentaband phones though, so please stop referring to phones that work on Wind and Mobilicity as pentaband. It causes unnecessary cofusion.