I never watch much college basketball and since we haven't owned any highly projected picks in a while I've really not payed much attention.
A few guys have caught my eye:
Raynaud -> 5 that can shoot it and showed massive improvement each year in college
Clayton Jr. -> drafting smaller guards is never exciting, but college veteran smaller guards are the easiest path to finding an NBA player late in the draft(Pritchard, Brunson, Nemhard spring to mind).
Flemming -> Strength, length and 3 point shooting make him really appealing. Although I do prefer taking guys that show more ability as passers or on the ball as I think that indicates feel for the game which is important even if you only project as a roleplayer in the NBA (see Semi Ojeleye)
Drake Powell -> This is a Danny Ainge pick. Highly touted high school prospect whose stock dropped after a tough freshman year. But the difficult season can slightly be excused by an uncomfortable situation around him in Chapel Hill.
Not sure if any of these guys will be there at 28. There are a few interesting Euros as well.