Went with the Nexus 7 (8GB) myself as well. So far, everything is looking good, even when I'm nowhere near a hotspot I can access. I bought $5 generic case ("icon brand") at Big Lots, which I've customized a bit, and I've got an OTG cable on the way (from Minnesota, not Hong Kong; it's worth an extra buck-and-a-quarter for a probable faster delivery and avoiding the possibility of something getting held up in customs), and if the OTG cable works, I've found an app that supposedly mounts thumb-drives (albeit strictly read-only) without having to root the device (and in the unlikely event that I ever have to get anything from the Nexus to my Mac or my DOS/Linux dual-boot, I can still email it to myself!).
For me, it boiled down to two things: (1) Kindle Fires and Nook Tablets are extensions of e-reader lines, and as such, they strike me as being uprated e-readers (and I have about as much interest in an e-reader as I have in retiring my DOS notebook, or my cell phone that's only a phone), and (2) I walk into Staples or Office Depot, and the floor-sample Nexus is a live unit, that may or may not be connected to a live hotspot, allowing me (if it is) to try it out on web content I use, whereas the Kindle Fire is locked into an offline demo that's undoubtedly optimized to look good on the device.
And it didn't exactly appeal to me that (if I remember right) both uprated e-readers tended to be set up to make side-loading difficult or impossible.
(And YES, I've had an international shipment held up in customs: a German fountain pen, shipped out of somewhere in the Far East, with the paperwork screwed up)