can you give us some idea on how much you willing to spend. I've been to the high arctic a number of times, but the kit I use is not on the cheap side. But to really honest if your going to be in those temperatures for any length of time then invest. Look at man made material as opposed to synthetics, heavier yes, but much much warmer, and a lot more hardwearing.
I use (not affiliated)
Mainly PHD and Canada Goose
http://www.phdesigns.co.uk/
http://www.canada-goose.com/
Jacket: Canada Goose Resolute Parker in Red or Snow Mantra in Red
mid-layers are good old fashion heavy wool jumpers, and merino
Base layers
are merino, long sleeved 200 rated
Boots
Salomon Arctic boots (plastic types) with the walk adjusters
Or Good heavy leather Arctic boots (must have removable liners, and thick insoles, pref felt as this rubs less IMO), take spare liners and laces (3 pairs)
Gloves : I used Hesta outer Mitts with 800 loft liners, and those thermal gloves that night stockist use in Supermarket freezer isles.
Socks -Good thick wool, and plenty of them.
Trousers - Phd Omega down with Gortex outers
Head Gear.
Ufronti merino Balaclava, merino beni ,and a Canada Goose aviators fur lined hat.
goggles: Oakley thermals with rip of lens protectors.
I think I've got it all, sorry but none of this is cheap, and I've built this up over a few years so the cost was spread over time
Hope this helps
D
Just as a side note:
you don't have to spend the kind of money listed above, but invest wisely. The woolly jumpers can be the type found in fishing shops, the trousers can be good quality guilted ski types with additional layers added.
THe bits I wouldn't compromise on are
Boots, Gloves, Jacket, hat.