Based on the results of the last 8 years, I'd say:
Top tier:
1. PSU
2. tOSU
Second tier - The next 7 in no particular order:
Iowa, NC State, Missouri, Oklahoma State, Cornell, Michigan and VT
These schools are pretty consistently near the top and solidly in the top 10. Some of these schools will occasionally have an off year but quickly return to relevance.
Third tier (on the fringe of top ten) - Nebraska, Minnesota, Lehigh
These schools are usually at or near the top ten and often have national title contenders. But they can't seem to crack the solid 9 above them on a consistent basis. Minnesota has dropped into this tier recently and has been replaced by NC State.
Fourth tier (aiming for top ten or fighting to get there): Wisconsin, Illinois, NW, Rutgers, South Dakota State, North Carolina, Edinboro.
These schools have occasional standout individuals and flirt with top 10 status but can't stay there if they achieve it. Pretty much the 12-20 place teams.
Fifth tier - pretty much everyone else. Not relevant for title discussion or top ten status. Most likely to move up are Oklahoma and Iowa State based on their traditions.
Top tier:
1. PSU
2. tOSU
Second tier - The next 7 in no particular order:
Iowa, NC State, Missouri, Oklahoma State, Cornell, Michigan and VT
These schools are pretty consistently near the top and solidly in the top 10. Some of these schools will occasionally have an off year but quickly return to relevance.
Third tier (on the fringe of top ten) - Nebraska, Minnesota, Lehigh
These schools are usually at or near the top ten and often have national title contenders. But they can't seem to crack the solid 9 above them on a consistent basis. Minnesota has dropped into this tier recently and has been replaced by NC State.
Fourth tier (aiming for top ten or fighting to get there): Wisconsin, Illinois, NW, Rutgers, South Dakota State, North Carolina, Edinboro.
These schools have occasional standout individuals and flirt with top 10 status but can't stay there if they achieve it. Pretty much the 12-20 place teams.
Fifth tier - pretty much everyone else. Not relevant for title discussion or top ten status. Most likely to move up are Oklahoma and Iowa State based on their traditions.