Get CIVF. From what I'm seeing this NB issue is fixable if you're willing to put the work in. It's a standoff issue that some boards have. If you have a gap between your NB and the heatsink of course it's going to get hot and not cool off.
Basically you separate the heat sinks from the board compare the SB standoffs to the NB stand offs, and if the NB is taller than the SB file them down to the same standards as the SB stands. I would also replace the stock TIM with some performance paste like AS5, Shin-Etsu G751(or X23) or IC7. Don't overdo it though cause it is conductive and there a spots abound that it could come in contact with when pressure is applied to the heatsinks.
The NB issue is nothing more than a physical error as they were probably out of the standard standoffs and went with what they had to fill the orders. That's FACTORY error not manufacturer error. If this were 100% on the schematics of the board then ASUS is hugely at fault. But I'm sensing a 50/50 failure rating by all accounts and with the short period of time it's been out that's not unheard of. What's good is that the issue has pretty much been spotlighted and it's a fixable one. Should you HAVE to fix it? No. But if you want to take your chances with RMAs' and or getting a used board/opened box in return(with a new purchase) then you're more than welcome. The very same issues plaguing THIS board could very well happen to the Extreme as they are put together at the same factories. I used to temp for Power Bar 10 years ago and their entire lineup was processed and packaged at the same factory. Same rule applies to most product.
So you can get it and fix the issue(if you have one of the offending boards) or you can hold off and possibly have to do it anyway with Extreme.
Oh and Bulldozer will be AM3. There's enough been written about it that if you know what you're looking at you'll see that it is. Like Thuban they'll have 2 versions. It's the CPU after Bulldozer that will be requiring a new socket.