If we had the chance at draft time? Drummond. there were many SG's available for cheap but zero bigs. Look at how much Aaron Gray cost and then look at Pietrus. Look at Kwame and then look at Willie Green. Look at Dalembert, then look at Barbosa. Bigs cost more. I would have drafted Drummond and spent on a wing. Period.
I like Ross, think he's going to be decent if he can turn his stroke into an effective stroke, but this is an obvious answer.