I would prefer Pekovic to Collison, so I would stay put. Stuckey is meh, and Collison would be a clear upgrade over him. But for overall value I like Pekovic over Collison. If you feel like you can move a big man to improve at point guard, then go for it.
This one is difficult because I think you clearly need a stronger backcourt. I would definitely drop Ridnour first and gibson later when irving is back. On the flip side, It looks like you only have cousins, lopez, and Jonas has your centers if you make this trade. I think I would stay put with Peko. I know he is underachieving but remember this is the same guy last year who averaged 15/7 last year with Love. Collison has been inconsistent and will only drop in some value with Nowitzkis return. Good luck! Hope this helps
I'm going to disagree with the majority. With Stuckey being pretty bad, the trade is basically Pek for Collison. Collison and Pek are about equal in value with the A/TO category added and Collison is not a negative in the 3 pt % cat. But the deciding factor is that your league has only 1 starting C position. With Lopez not being a great rebounding C, I would rather try to gain in the assists category and a rotation of Collison, Holiday, and Ellis.