[LifesGreatestGift]

Open up your postbit_legacy template and look for the following:

<if condition="$post['replylink']">
<a href="$post[replylink]" rel="nofollow"><img src="$stylevar[imgdir_button]/<if condition="$post['forwardlink']">reply_small<else />quote</if>.gif" alt="$vbphrase[reply_with_quote]" border="0" /></a>
</if>

Make it look like this:

<if condition="$thread['firstpostid'] != $post['postid']">

<if condition="$post['replylink']">
<a href="$post[replylink]" rel="nofollow"><img src="$stylevar[imgdir_button]/<if condition="$post['forwardlink']">reply_small<else />quote</if>.gif" alt="$vbphrase[reply_with_quote]" border="0" /></a>
</if>

</if>

That will disable "Quote" on all first post's (topic starters). You may place it on the quick reply as well if you'd like.