I would love a modern version of the N900/N810. If I could get one with a recent ARM processor, good slide out keyboard, and running a more desktop-oriented Linux install (meaning more hacking/developer friendly than just Android), I'd be seriously tempted. Sadly, I assume the current component prices would mean it would be too expensive to be realistic.
I'd buy an N810 formfactor right now with modern guts.
Funny I tried to buy one of those breakout blackberry keyboards but they were sold out everywhere
This with DisplayPort Alt-Mode so it can be docked for desktop use is pretty much my dream device.