Hum,
I can't answer I dont know players skills. But to talk about skills, I like good OD (14) for PG/SG with a lot of passing (11-12) and a good handling/driving combo (13-14).
For PF/C, of course a solid IS, ID, REB (13 for each minimum) but I like good passing (7-8) and handling/driving (8-9).
It's hard to have an all-around SF but I like this type of player : OD/ID (11-12 for each) with a lot of handling/driving (12) with passing and rebounding (8-9 for each) but It's hard to have all of this skills in U21 team...
Morwood what you think about SF for U21 team ? And with new game engine what you think about blocking for PF/C ?