I'd give up Semih for Parker, no problem. Parker is a legitimate back-up wing (excellent spot-up shooter, good passer/decision maker, decent defender, poor rebounder, unathletic). Parker is arguably an upgrade on Daniels due to his marksmanship (a more useful trait than Daniels situational post-game).
Semih is a marginal NBA player (below-average rebounder, turnover-prone, mediocre finisher, foul-prone, mediocre defensively, good size and lateral quickness).
I'd be hesitant to give up the 2011 1st rounder though. I really want us to snatch Kenneth Faried (a combination of young Ben Wallace in terms of athleticism and rebounding and Leon Powe in terms of aggressiveness attacking the rim) in that range.