hi guys about to order a Nexus6 off amazon/bestbuy!? (carrier question)

I just want to make something really sure before i order it ,to start it of with my question i woudl like to know whether it will work with the Sim card (network carrier in where i live) i am from the Middle East,

and our carrier here has that GSM service thingie xD sorry for being so noobish.

i want to get the Nexus 6 over the new Moto x Pure mainly because of how much dev. support and how many Roms are already out for the Nexus 6.

what is the difference between the so called international version ?

anyway if i buy it from here http://www.amazon.com/gp/product/B00..._gw_p107_d0_i1

will that be working with the sim cards from where i live ?

thanks in advance!