in 6K you can assemble a darn good PC!
try looking around in Sofitel as its the only place I know where you got Hardware.
or if you know someone in Dubai it'll be a lot cheaper over there.
unfortunately Qatar's not too advanced when it comes to buying/selling high end computer peripherals.
last but not least if you still don't find anything .. just let me know & I can order pretty good hardware from Pakistan.
you can check this website as I usually order stuff from here .. its galaxy[dot]com[dot]pk
cheers ~