Now is the best time to buy the Samsung Galaxy SIII LTE I9305 which has quad core,2 GB RAM and the best part is it supports LTE (800 / 1800 / 2600 MHz).
Q-Tel (Qatar Telecom) has also confirmed via Twitter the phone will be supported once LTE is fully launched in 2013.
@binodc yes it will support it when we launch the 4G on 2013
— Qtel Qatar (@QtelQatar) October 7, 2012
Understand about QTel LTE/4G at http://www.qtel.qa/en/4GLTE
Read more about the specification at http://www.gsmarena.com/samsung_i9305_galaxy_s_iii-5001.php