Am I sure if it's international? Yeah. What was the problem he faced when trying to register?
No, you don't have to. You can plug the monitor cable into the graphics card port if you want to focus on gaming. But if you want to use Lucid Virtu, you will have to enable iGPU multi-monitor in the BIOS. Only then can Lucid Virtu activate.
This is a component only thread and we don't normally take inquiries about notebook here. But if you want to know the prices, why don't you head on over to my.asus.com and download the product guide?