If i change and redesign my site and say base around worpress. Will there big a problem going from current urls which are .html extensions to permalinks without this extension. Would i lose PR and SERPS? I have about 200 pages all pretty much hard coded apart from blog section. Would the solution if this is a problem be add .html to the extensions in permalink settings within WP? Re-directing 301 would not be possible with this amount of pages would it??