Trevor Ariza is a rich man's Jimmy Butler. Bulls need half-court offense. I don't think having two wings that can't create their own shot is really going to be a great gain. He would help in terms of being a capable three-point threat and additional transition scorer. I wouldn't use the word ideal, but that's me.
Taj for Dragic isn't out of the realm of possibility. The Suns need a decent PF. If Dragic gives any indication that he is not going to sign an extension, Phoenix might decide it'd be better to get something solid for him rather than nothing.