Dell Inspiron 7537 or ASUS N550JV / N550LF or lenovo Z510/Y510?

HI, i want to buy a new laptop, i want something reliable, fast, long lasting, & almost can do it all.
i kinda want it as a pc replacement, with a great screen to watch movies. I'm not a heavy gamer but i need it to play some games in a decent quality. I did a little research & narrowed the options to the above mentioned 3 laptops. I have questions & concerns about each of them & will appreciate your help.
Inspiron 7537 - poor Wi-Fi connection? Not that good display? Dell laptops breakdown frequently? No dvd. Worth the price?
Lenovo z510. Not that good display? Looks cheap? Is it really reliable & serve long time.
Lenovo y510. Is there any real differernce between it & the z510. Again the display, built quality & if it really worth the price.
ASUS N550JV / ASUS N550LF. I really don't know what's the difference between these 2, touchscreen in the LF maybe? Anyway. I liked these alot but i didn't find any detailed review of any of them, there's complains though about slow performance as a result of windows 8?! I don't want to stuck with a slow laptop at the end. It's a lifetime purchase.
If you have any other suggestions i will appreciate it.
Thanks in advance.

Added (1). forget to mention, Battery life?! I hate to be connected to charger all time. Will appreciate 2-3 hrs battery life.

Added (2). another thing. What about overheating & fan noise?!
& when you post answer, would you please explain why you recommend that specific model?
Thnaks.

Added (3). update 3 - i really like the presence of DVD Drive in Asus & Lenovo.

I ended up buying dell inspiron 14R. Till now it's awsome.

Lenevo z510. Best at specs and also comes at an affordable price.

Dell Inspiron 7537