Rob, I actually have two pairs of the new version already. One is well worn and one I'm holding back the miles on for the marathon. I was just hoping to use a couple of $50 gift certificates I have so I don't have to pay full price.
Andrew, the Green Silence definitely sounds like a shoe to try. Only one millimeter additional heel-toe drop, with the same toe height, and 6.9 ounces instead of 7.0 ounces. Sounds like almost the same shoe. As a bonus, my sponsor has them in stock in some sizes. I might have to give them a try.
Also mentioned to me was the Saucony A4, which is a bit less shoe but very similar to the Hyperspeed. It seems like I have a couple of options to try and, if those don't work out, I can order some through RRS.