HT have the readynas NV+ version 2 for an insane price of $248 + shipping. This is a fantastic unit and has the robustness of the readynas product range.
The Marvell ARM cpu is still in it's "infancy" stage so there aren't as many addons as X86 or SPARC versions but it's very fast in comparison to the old SPARC NV+ I have.
Dammit… i bought it 2 weeks ago for $498, so a great find
EDIT: i had problems with my first one and got it exchanged yesterday, albeit with a bit of hoopla from HT.