I like the way you think, brother. Give me Mack and I would be thrilled, just about no matter what else happens in the draft.
I'm not so sure about Dallas wanting to trade up as you are, but for Mack, I'd do it in a heartbeat.
I wouldn't want to do it for Clowney though. I'm just not sold on his mental makeup. A huge part of what I love about Mack is what is in his chest and between his ears. The guy goes all out all the time, loves to play football, and plays with a mean streak that most of the great defenders have. I'm not even sure that Clowney likes playing football. I mean, maybe he does... but I just don't know.
I would move up to about 7 or 8 for Mack and for Donald, I would go up to around 11. Barr, I might go up a little for, but I'm not sold on him either.
For me, about the only guys I'd trade extra picks away for would be Mack, Donald, or Manziel. Anyone else, I'd just stay at 16... but that's just me.