Is this idea good? instead of making different conditional stylesheet for different versions.
One conditional css for all IE version
<!--[if IE]>
<link rel="stylesheet" type="text/css" href="all-ie-only.css" />
<![endif]-->
and for example this is content of all-ie-only.css
selector {
color : green\9; /* IE8 and below */
*color : yellow; /* IE7 and below */
_color : orange; /* IE6 */
}