I had wanted DiPoto to go after Anibal. Seemed like a good budget pick up (compared to Greinke) which would've allowed us to keep Torii Hunter. The Blanton signing instead was a huuuge WTF moment. The rest of your list though is questionable, at least in terms of whether or not they will continue to pitch as well as they have.
Even if they do though, and even if the Angels had magically been able to bring in all those guys you have to ask how much better this team really would be. The organization still has no depth, the bullpen is still barren and the rotation, while likely being better off so far might not be better from here on out.