Hi,
I havent tried the ones mentioned, but I do a fair bit of XML work and a lot of the advanced text editors generally have templated for it, such as UltraEdit, CrimsonEditor, or EditPad. I would suggest CrimsonEditor as its free (from memory) and not too complex to use
http://www.crimsoneditor.com and is a really good replacement of that crappy NotePad that comes with Windows......
Cheers
Michael