@ io53:
You can use the Atmel tables for comparison:
Here is the table for the AT32UC3 lineup:
http://www.atmel.com/PFResults.aspx#(data:(area:'',category:'34864[33180[33080]]',pm:!((i:8238,v:!(0,18)),(i:8394,v:!(0,17)),(i:8362,v:!(1,28)),(i:8282,v:!())),view:table),sc:1)
And here is the table for the SAM3X series:
http://www.atmel.com/PFResults.aspx#(data:(area:'',category:'34864[33177[39581]]',pm:!((i:8238,v:!(0,18)),(i:8394,v:!(0,17)),(i:8362,v:!(1,28)),(i:8282,v:!(0,1,2,3,4,5,6,7,8))),view:table),sc:1)