The main difference is that the X1000 was sold at a loss due to a much increased price of the CPU. The X5000 will be cheaper to make (and even cheaper still as they will make 500 of these). But the end user won't notice that much difference as A-Eon strives to make a tiny profit this time.
I think over £400 cheaper for a full system is somewhat noticeable. It's still very expensive but closer to what CSPPC boards changing hands for these days.
