there are way too many variables to look at...not only your own players ath/spd and ability to create shots, but their LP ability (PER/LP ratio will determine how many 3's they would take set at 0...so a player with both LP and PER being high would have more balance than a guy with high PER and low LP), expected distro, expected opponents defense style and setting, ability to penetrate and score at the rim, free throw %, etc but you also have to consider how badly you need this player to shoot from the outside..are there other better options, do you need to create more balance in your offense, and so forth