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Then you're in luck; each core of the Pi2 is about as powerful as a 800MHz PIII. Fortunately, there's four of them, plus the various hardware accelerations, so it'll still be much faster; since x264 is almost perfectly parallel, you can assume a ~4x speedup at the same settings. They also have a hardware encoder, which is very fast indeed but as always, a bit lacking in quality. Good more for intermediates than finals. It does support OpenCL, but it might be tough to find anything that makes use of it; I'm not sure if it's powerful enough to run KNLMeansCL, for instance, but it's worth a shot.
I don't know much about any of the others you listed. The NUC and the Acer Revos are even more powerful micro-PCs, but they're also ten times the price of the Pi.
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