ISU over UCLA in '77 gotta be #1. That was also the highest attended game in Big Sky history, it was in Provo, UT - 21,000+ attendance.
Weber over 3-seed North Carolina in '99 for sure. Weber over 3-seed Michigan State in '95
Weber vs UNC highlights - http://www.weberhoops.com/upset - never gets old to watch.
As of recent:
Montana over WAC champ Nevada was pretty cool, PSU of course over #7 Gonzaga.
MBB Notes - Dec 29, 2008
http://www.bigskyconf.com/news/mbball/2008/12/29/MBBnotes122908.asp?path=mbball
Below is a list of Big Sky teams beating ranked opponents throughout the years:
Year Schools Location
2008 Portland State 77, No. 7 Gonzaga 70 Spokane, Wash.
2006 Montana 87, No. 20 Nevada 79 Salt Lake City (NCAA Tournament)
2002 Montana 70, No. 17 Stanford 68 Palo Alto, Calif.
2001 Eastern Washington 68, No. 10 St. Joesph’s 67 Berkeley, Calif. (BCAC Tourney)
2000 Cal State Northridge 78, No. 15 UCLA 74 Westwood, Calif.
1999 Weber State 76, No. 13 North Carolina 74 Seattle, Wash. (NCAA Tourney
1995 Weber State 79, No. 11 Michigan State 72 Tallahassee, Fla. (NCAA Tourney)
1984 Nevada 97, No. 11 UNLV 79 Reno, Nev.
1982 No. 8 Idaho 69, No. 16 Iowa 67, OT Pullman, Wash. (NCAA Tourney)
1982 Montana 53, No. 8 Idaho 51 Missoula, Mont.
1981 Nevada 86, No. 15 UNLV 76 Las Vegas, Nev.
1981 Idaho 71, No. 16 Oregon State 49 Moscow, Idaho
1977 Idaho State 76, No. 2 UCLA 75 Pocatello, Idaho (NCAA Tourney)
1977 Weber State 71, No. 17 Utah 61 Ogden, Utah
1975 Montana 68, No. 13 (UPI) Utah State 63 Pullman, Wash. (NCAA Tourney
UM over USU in '75, that was Heatcoate, taking UM to first ever NCAA Tourney, Heathcoate ended his career in '95 being upset in the first round to Weber.