I've been really happy with my Das Keyboard Professional. I've been using it as my main keyboard since it was first released about 15 months ago.

http://www.daskeyboard.com/daskeyboard_original_professional...

The only downside is the $129 USD price. You'll have to decide if it's "reasonably priced". I got nice discount on a pre-order, but at this point I would gladly pay more. This thing doesn't show any signs of ever dying on me though.

Update: I just checked and it's actually on sale right now for $109 USD.