In reply to matthew jones: Pontas are pretty much the same size as Anasazis. Most people get the same size in each.
I've just held one of each against each other to check - both size6s are almost identical in length. The Pontas has much less heel tension than the Anasazi though so may feel a little different.
The sole unit of the Anasazi is noticeably wider around toes4 and 5 and the end of the metatarsals (ie just forward of the velcro) but in my opinion the Pontas has more volume. Which feels widest will depend on the exact shape of your foot. Most noticeably, wide flat feet don't tend to get on well with the Pontas.
HTH, Iain