Above specification will not be available in Qatar.
It will be expensive but will not expensive as someone here commented.

You will need to procure from outside Qatar.

I suggest to look in Amazone.
The big gaming PC casing you may find in Tornado computers near Sofitel (since it is heavy and shipping charge also will be heavy). Others you can procure online.
These are my suggestions and aprx costs.

Intel Core i7-3930K------------ -----------$570
ASUS P9X79 LE LGA 2011------------$240
Corsair Vengeance 64GB (8x8GB)---$495
GeForce GTX670680 (1 nos)-----------$500

I may give you some guidance if you need.