N550LF-CK064H, i5-4200U + Nvidia GT740M + (1366x768; touch)@RM3099[2.6kg], 4GB, 750GB
Y510p, i7-4700MQ + Nvidia GT750M(GDDR5) + (1920x1080)@RM3399[2.7kg], 8GB, 1TB, W8, red backlit, swappable ODD, 120w psu, 2 yrs
Y510P has more CPU and GPU power to deliver better gaming experience.
But Y510P is over your budget already.
Btw, N550LF, iinm, don't have FHD spec
Closest:
MSI
GE60-2OC, i5-4200M + Nvidia GT750M(GDDR5) + (1920x1080; anti-glare)@RM3099,8GB, 750GB(7200rpm), W8, steel series KB
Prices are RSP, negotiable.
Don't bother with touch screen on 15". You hand will get tired easily poking across keyboard

Suggest you quickly take out the HDD (and put in external casing), and make a backup of all your important data.
Don't run anymore test on the HDD, it may make the situation worse.
MSI would be an good option to replace the Asus N550LF. Will think about it.
Ya, i already backup all the stuff in another HDD. So now just wait the RIP of the Toshiba.
Thanks a lot for the info. Will try to do some details and review about those laptops.