None of the product mentioned will even come close. If your porcelain tile is grade 3,4 or 5 you will need this
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=260690071601&ssPageName=STRK:MESE:IT
Follow the instructions on this page and you will be fine.
www.toolvolt.co.uk
Use a masonery drill bit,put masking tape where you are going to drill, mark the hole and drill on very very slow speed DO NOT have the hammer action on,once you are through the glaze you can speed up a bit.