Not quite right
mixture - seems MS bent the rules for XP. XP Home & Media Editions gets the same extended support as Pro:
XP Home
XP Media 2003 Edition
The master list:
Support Lifecycle Index
Looks like they've done the same with Vista too - everything aggregated under the SP level (click on Ultimate & you'll see the same support level as Home, so SP it is).
Definitely agree about not running Windows outside the extended support period. Time to start planning people - XP is a dead duck.