I'm not a huge fan of these super skinny yet tall athletic SF types (Batum, AK, and Dunleavy come to mind). Oftentimes they lack the lateral quickness to stick with most SFs. Just look @ AK...
I'd much rather have a decent scorer(paul piece, Deng, Hedo, Grant Hill, Galinari etc) and solid player who can hold his own against postup SFs and not be too tall to stay with others. Or a deadeye shooter @ SF, like Battier, Ariza, Danny Granger, Durant, etc.
I just feel that playmaking should mostly be done by the PGs and SGs. A personal preference I know...
So unless Jan Vesely is a can't miss prospect, I'd rather pass.
If we go after a SF, I'd rather go after a more proven, fundamentally sound, and physically "tougher" prospect like Leonard or T. Jones.
Vesely has upside just given his length and versatility. AK could have been an incredible player if he developed his offense. However, Vesely is by no means a sure thing. I think Terrence Jones is a safer, more conservative pick.