Since you're running man, I would suggest emphasizing REB (along with ATH / DEF). This means your SF should look more like a fast PF than like a slow G... and here's why:
Creating a good man defense requires high ATH / DEF from your PF and C. In D3, high ATH / DEF PF/Cs usually have relatively low REB. But a good man defense will generate a lot of missed shots and therefore rebound opportunities. If your SF is a better than average rebounder, you will convert more of those rebound opportunities into defensive rebounds, meaning fewer offensive rebounds for your opponents.