I am holding a Lumia 730 upgrade from Lumia 520 last year. My screen has cracked and I m presently buying a new one rather than going for 8-9k to change the screen. I heard the windows 10 gonna support LED notifications provided the drivers are present. Does 640Xl have it? Is it wise to go for 640Xl or buy the Lumia 730 again? Please advise .