The Dallas trade is insanely stupid and I dont think either team would do it. The LA deal makes very little sense for LA whos already the class of the West, it seems like an unnecessary dice roll. If the Suns did the deal w/ LA they'd likely not resign any of the 3 players so its a pure cash dump, with that in mind I'd hope they'd at least get a 2nd round pick back from LA, they'd need something to help them in the future.
Shaq for Starbury works straight up. If Im Phx I'd explore that, with a draft pick of some kind thrown in from NY. D'Antoni likes Shaq, and adding to that team for basically nothing probably secures their spot in the playoffs and gets Shaq out of the West for whatever thats worth. Maybe the Suns could also try to get Wilson Chandler back in the deal, he's a nice young player, the Knicks would probably be more willing to that than give up a pick.
The Heat deal is my 2nd favorite that Ive heard, though I do have some concerns. Marion would probably hate to come back to Phx and while Im not too worried about him being a cancer this year, Id like the Suns to find a way to sign him to a reasonable deal that would take him to the end of his career since I think he can still be a contributor (maybe something like what Diaws making).
Also, you're trading a guy whos already a star PF for a guy who might become one. We all think Beasley will be good, but its still a bit of an uknown With Jeff Green at least you've got more tape on the guy in the NBA. Finally any picks coming from Miami may not be all that great (i.e. non lottery) since Amare-Wade is a nice duo.