There's only 1 of those 3 been released so far. And even that 1 seems hard to come by judging by the vendor's availability status.
> these new boards are made by a tiny company with little money to test and develop, which > probably will make these boards more prone to having problems than boards made by huge > corporations. [...] There is a chance that my Mac Mini might outlive the X5000 for this reason.
The Nemo board has been in the hands of end users for almost 4 years and I've yet to hear of any problems in terms of design faults or bad build quality. Varisys seems trustable here.