Living in Pittsburgh, I've watched plenty of Aaron Donald. He was actually my choice at 29 awhile ago, until the recent combine performance, which has now put him way above our reach. I would LOVE the thought of him coming here, just love it.
I don't see a ton of value in either one of your trade scenarios though, to be honest with you (not meaning to sound negative). I just don't know if giving up our second rounder OR Don'ta Hightower would be worth it, as enticing as it sounds.
We'll obviously have a strong need for both Hightower/2nd round pick this year. For what it's worth, I'm not a big fan of Hightower either, I just think that it's too much to lose both he and Spikes in the same year.