I have CVT Avant Stellar keyboards on the two PCs I use most. They're not the "ergonomic" style (I don't think I have whatever problem those solve) but they're supposed to be designed by whoever did the original Omnikey keyboard (which I have on another machine and love), and indeed they have the same wonderful clicky feel and metal back. I like them so much that I bought a spare (even though it was $189) since I didn't want to go through withdrawal when one of these dies, but it's never happened. Once in a while a key will get flaky (stubborn and/or bouncy) but then I'll just pull off the keycap (tool is included), dribble some 91% rubbing alcohol into the switch, and then I'm back in business.
Besides the reliability, nice feel, duplicate set of pre-EKB F-keys on the left (I've been using the same editor since 1983 and pressing those keys is involuntary at this point), I *really* like the fact that they included extra keycaps (and that tool I mentioned) so you could put Ctrl to the left of ASDF (as God intended, or anyway, all the non-PC keyboards I ever use) even though the Ctrl and CapsLock keycaps aren't the same size and so aren't swappable. There seems to be a slight bug in the firmware though -- obviously I programmed the keyboards to exchange those two keys, but once in a while they get confused and what's now the Ctrl key ends up working as CapsLock anyway (so the LED comes on and I'm shouting until I notice and fix it). It doesn't happen often enough to affect my loyalty, but it's weird.
ANYWAY so if the Northgate name on this ergonomic thing means it's in any way similar to the earlier Omnikey and Stellar KBs, definitely definitely buy one.