Landry would give the Suns the rebounding and the hustle they lack if they're to lose Amundson.
Garcia is a versatile player who like Hill and Turkoglu can shoulder some PG duties off Nash. He's also a decent perimeter shooter and a good perimeter defender.
Greene is 6"11 PF size but plays SG/SF. He has 3 pt range who fits perfectly into the Suns system. Although he may not be a terrific on-ball defender, his length can still bother shots by opponents' SFs or SGs.