What is the best SharePoint compatible XML editor?

Hello. I need an XML editor which would make SharePoint xsl developtment easier (People Core Result etc). Which would be the best XML editor for my purpose?
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XML Spy by Altova (http://www.altova.com/xml-editor/)- it integrates in Visual Studio;
<oXygen/> XML (http://www.oxygenxml.com/download_oxygenxml_editor.html);
obviously Visual Studio will have XML capabilities...
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