I'd go with the Vario model... you can switch up the pack if you need to pack more stuff with you... Plus you will have more flexibilty if you need to sell it (it will appeal to more people).
I just got my Vario pack from SnowBigDeal... Awesome customer service and super fast service... Everything ships from the USA and they take credit cards over the phone without needing to print out a form and fax it back...
I will be buying the Rocky mountain Extreme Freestyle pack that they had custom made to zip onto the ABS Vario base unit in addition to the 30L pack that I got from SBD.
It was just too much of a headache to deal with shipping across the border for a $1000 item with all of the Customs and broker BS out there...
I hope I never need to use it but I was impressed with the test fire operation.
Vario Base unit
RMX Freestyle Vario pack
Base unit with 30L pack
Base unit with 15L pack