Buying Laptop(Gaming). Needs Advice?

My Budget Is 45000-55000 (+-2000)
I've Gone Through All The Things And Have Landed On These 4 Laptops.
Dell- http://www.flipkart.com/...JC9STYFRP9

HP- http://www.flipkart.com/...2GHCPAPRWH

Acer- http://www.flipkart.com/...Y4F3NME9JJ

Lenovo- http://www.flipkart.com/...3G48JC24H5

I've Searched Everything Related To Performance And Gaming.(Cores, Graphic Card, Clock Speed, Ram Etc.)

If You Think I've Missed Any Laptop Which Gives Good Performance Then These 4 Then Please Let Me Know.

I Want To Know Which One Is A Better Laptop, Keeping In Mind All The Factors(Like- After Sale Service, Parts Avilibility, Warrenty Issues Etc.)

Dell/HP - Decent computer builds, but their customer service is actually terrible.

Acer - Absolute no go. They have terrible builds and the warranty on their Laptops hardly cover anything.

Lenovo - Great computers, good customer service and very reliable - GO FOR THIS ONE

@Nayan I Need Specifics(Reasons). (Although I Know, It Has The Best After Sale Service)

Go for dell only

"HP Pavilion 15-p045TX Laptop" is the best laptop in your budget. It comes with -> i7(4th Gen) Processor, 8 GB RAM, 1TB HDD and Nvidia GT 840M Graphics Card.

As you can see, this laptop has a very good processor for everyday tasks, 8 GB RAM is more than enough for running any game and multi-tasking. It also has a 1 TB Hard drive which will allow you to save lots of files. The best thing about this laptop is the "2 GB Nvidia GTX 840M Graphics Card" which will allow you to run all modern games(Battlefield 4, NFS Rivals, Watchdogs etc) at high settings easily. Go for it. Its the definitely the best laptop at this price.

Specs:-

Core i7 (4th Gen) Processor
1 TB Hard Drive
8 GB RAM
2GB NVIDIA GT 840 GDDR3 Graphics Card
15.6 inch
Windows 8.1 OS

See user reviews and buy at best price @ Flipkart -> http://www.flipkart.com/...svmtruegma