JQuery :: Reference Specific Items From A .find()?

Here's the sitch:

I've got the a bunch of selects back from a find:

Code:
var selects = $( "#my_id").find( 'SELECT');

Now I want to say this:

For each {desired value} in array with index ix Select the {ix}th select box Set the option in the {ix}th select box whose value == {desired value} as selected

I know it's really exceptionally easy, but I suck at jQuery...

I think it looks something like one of the below two lines:

Code:
selects[ix].val( {desired value});
OR
selects[ix].val( {desired value}).attr( 'selected', true);

but I know the select[ix] syntax is wrong, and I don't know how to reference an item at a specific index from the jquery object returned by jquery.find()