Sivik,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<form id="id1">
<select name="name1">
<option value="1">вариант 1</option>
<option value="2">вариант 2</option>
<option value="3">вариант 3</option>
</select>
</form>
<script>
var clone = document.getElementById('id1').cloneNode(true),
options= clone.getElementsByTagName('select')[0].options;
options[0].text = "НЕ вариант";
document.body.appendChild(clone)
</script>
</body>
</html>