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Autocompetition works with NO PROBLEM for Models, guys, this is really simple :)
Only thing you have to do is use a phpDoc:
class CommentsController extends AppController {

var $name = 'Comments';
/**
* @var Comment
*/
var $Comment;
...
Actually that probably wont work in Aptana's PHP editor, because its in early stages of developement and lacks context (scope) on autocompetition.
Above example is for PDT, which is (actually) best choice for PHP developement on Eclipse.