Took some time to chart a few things out. Thought I'd share. If I can figure out a way to allow google docs to show my work without allowing everyone the ability to edit, I'll add a link.
Edit: Thanks, Palmerkun. spreadsheets.google.com/ccc?key=0AhwsrN_...
Using the 20 Origins in the Core rules:
Approx 400 different character origin combinations. Keep in mind that an Android/Cockroach (Int 18/Dark Overcharge) is different from a Cockroach/Android (Con 18/Bio Overcharge), but a Felinoid/Rat Swarm is the same as a Rat Swarm/Felinoid (Both Dex 20/Bio Overcharge).
Of those 400 combos:
20 are Enahanced Humans.
51 will have an ability score of 20
56 will have no at will powers
6 are in trouble if combat goes long (no at wills, no ability score that will give a guaranteed +3 minimum bonus to basic attacks).