MLB.com suggests that the Angels would have to part with either Adenhart, Jeff Mathis, Howie Kendrick, or Ervin Santana to get their hands on Holliday. The latter three have all been integral parts of the Angels MLB best 57-38 record and are unlikely to be traded. A package including Adenhart, Rivera or Matthews, and another pitching prospect could get a deal done.
The Angels are thought to be more interested in Holliday than Teixeira. He would likely take over left field for Garret Anderson in '09. Assuming that Vladamir Guerrero's $15 million option is picked up, the Angels would then only have to focus on resigning Francisco Rodriguez and signing a 5th starter to take the spot Adenhart would have otherwise occupied (although Kelvim Escobar is signed through '09).