I wouldn't mind Whiteside, but don't really care for Barnes at max money. Rather keep Amir and Jonas, draft Valentine using our Dallas pick, and just roll the remaining cap over the following season.
So our team would look like this:
1st team - 2nd team
Thomas - Smart
Bradley - Murray
Crowder - Valentine
Olynyk - Jerebko
Whiteside - Johnson
Two stretch 4's, improved shooting with Murray (40.8% 3's) and Valentine (44.4% 3's), with both those shooters being good ballhandlers and passers, and improved interior D with Whiteside. So our team improves without sacrificing long term cap. Not being able to give Rozier minutes really hurts though.