$3000 ...or...
wait until the end of the year and you'll be able to pick up something Pi-ish based on open source and a cheap board with an Allwinner 64-bitter for under $100.
AMD has been promising shipments of its 64-bit ARM-based server chips, code-named "Seattle", for the end of the year but now you can get hold of one with the firm's latest developer kit release. From Wednesday those with the cash can hand over $2,999 to AMD and in return get the AMD Opteron A1100-series developer kit …
Actually you can and should compare the two. I'm more than willing to drop $10K of my own money on the first iteration of an idea here. In this case, no I don't think this is a "good deal." Then again I'm not amongst the targeted audience. No one will be picking up my tab here and I don't see a valid use case either as even this niche is already covered.