Trophy quality has little to do with inches in my mind. We all want the biggest/oldest animal we can find but judging hunt success with a tape measure just doesn't cut it for me either.
Nevada has some great sheep for sure, but last year's Hunter Check-out shows the average ram taken in Nevada in 2013 was 153 3/8 (according to Game Department measurements)
Two units didn't harvest a ram over 140, and in a good portion of the units the biggest ram taken was in the 150's
Given those statistics, a 160+ ram is special.
Also noted is that the average age of Nevada rams taken was 6.3 years old. There is a great argument that age should also factor into trophy quality, especially in sheep. BuzzH's pictures are a great example.
When I hunt, half the fun is scouting to find a good animal. So, as has been said, if this ram looks good, go after him, unless your scouting turns up one you like even more.
Best of luck!