Monday I will be crossing Nebraska E-W and am curious if any of the I-80 alternatives have merit:
US 30
US 6/34
NE 92
Or should I just take 80?
I've done all of US 6 and US 30 in Nebraska, and most of NE 92. The last is far less boring than the first two, especially the west end which takes you to Scottsbluff, nearby Chimney Rock, and part of the Sand Hills region. But I don't remember anything special about NE 92 between Arthur and the Omaha metro area.
You could take I-80 west to Ogallala, then take NE 61 north to NE 92, to speed your trip to the more interesting parts of NE 92.