You want guys Rivals rated high that didn't do much in the NBA?
In 2003, they had James Lang #4, Brian Butch #5, David Padgett #7, Ndudi Ebi #9. In 2004, they had Malik Hairston #7 and Joe Crawford #9. Richard Hendrix #9 in 2005. 2006 was a pretty strong class but they still had Javaris Crittenton #7 (probably played more minutes in the NBA than anybody else I'm listing) and Paul Harris #12. 2007 was a super strong class. Scotty Hopson #5 and Willie Warren #10 in 2008. Michael Snaer #7, Tiny Gallon #9, and Mouph Yarou #10 in 2009. Josh Selby #1, Tobias Harris #7 in 2010.
Pretty much you should expect a guy if he's ranked in the top-10 to make the NBA, and after that it gets more hit or miss. I'd say about half of the guys in the 10-20 range make the NBA but it kind of varies based on class strength. Once you get below the top 20, you're more likely to not be an NBA player than turn out to be one and the frequency of pros decreases the farther you go.