My guess is that they don't have rights to BET games, so they are picking from the regular season. We've done this thread before here, but the classics from the regular season that always jump to mind -
Beating Georgetown at home in the dream season (#1 regular season game ever)
The roller-coaster win at St Johns in 1999
Coming back from 25 down to beat Pitt (with Ray and Donyell)
El-Amin on the scorer's table at Pitt
Ollie going coast to coast to win the sarcastic clapping game
Double overtime win over BC in a Donyell vs Curley game.
On the negative side, you won't see a more dramatic ending than that Darius Rice 3 (and Ben Gordon went off that day for us, so it was a good game).
Out of conference:
Arizona in overtime (Emeka's coming out party)
At Stanford without Rip
Gonzaga in OT after Price tied it with a three
Michigan State with Kemba in Maui. (Perhaps Texas but the MSU one was a better quality game)
Ray's team beating Duke (maybe 92-86 - quality game).