Pretty sure this was sparked by my post about the medias ridiculous need to claim there is actually a QB competition.
From a starter perspective, I would say there are 3 potentials, OG, CB and S
Like you said, Oboushi vs. Winters (and possibly vs. Colon for 2 spots, but I expect Colon is all but handed one)
McDougal vs. Patterson (highly tilted against the rookie despite the numerous positive reports.)
Pryor, Allen and Landry for 2 safety spots. It's highly expected than Pryor takes one, but given that he already has a concussion, and he may end up being slowed in his development depending on how long he is out. Meaning he may not start the season as a starter. As to the other spot, it's experience vs. youth/speed.
Otherwise it's all depth battles/ST competition.
Edit: Bo's right, that FB competition is probably the most up in the air (yet the least talked about in the media)