var $elm = jQuery.each($('.myClass'), function() {
    if ($(this).attr('top') > x) return $(this);
});

var $elm;
jQuery.each($('.myClass'), function() {
    if ($(this).attr('top') > x) {
        $elm = $(this);
        return false;
    }
});

var elem = $('.myClass').filter(function() {
    return $(this).position().top > 200;
}).first();

var elems = document.getElementsByClassName('myClass'), elem;
for (var i=0;i<elems.length;i++) {
    if (parseInt(elems[i].style.top, 10)>200) {
        elem=elems[i];
        break;
    }
}