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my chat and mailserver runs on a gk802 cortex a9 quadrocore 40nm with headless debian, but its absolute overkill :P
gk802(quadcore cortex a9 @40nm @ 1.2 ghz+quadcore video Vivante GC2000(more...

im sorry to say, but rasberry is just a hype.
buy cortex a9 devices.. depending on what purpose you can buy it really cheap.
the fastest micro device is the RK3188 quadro cortex a9 28 nm @ 1.8 Ghz...