Ok then. You can go for Lenovo 510-p. It's only 65 less performing than the dell.
NOTE: The
Lenovo 510 Series Laptops are discontinued in flipkart and you may find it priced a little higher in other online stores or offline stores.
Don't rely on flipkart specs. they're absolute crap. The dell has the "U" series CPU which means ultra-low voltage which consumes lesser power. Check these real world reviews (reviewed in all categories):
Lenovo Ideapad Y510-P vs
Dell inspiron 15R 5537
Also, what I've gone through is:
Lenovo Y510p
Advantages:
1.1080p screen.
2.CPU can be replaced/upgraded.
3.GPU can be upgraded.
4.Keyboard Back lightening.
Disadvantages:
1.Costlier than Dell.
2.Heavier by a small margin.
3.Poor battery life.
Dell Inspiron 15
Advantages:
1.Great Battery life ( ~12 hours while torrenting)
2.Lighter by a small margin.
3.Slimmer.
Disadvantages:
1.720p screen.
2.Driver compatibility issues.
3.CPU soldered to board and can't be replaced/upgraded.
4.No Keyboard back lightening.
Both Dell and Lenovo have great After Sales Service.
P.S. If you want long lasting laptop (in terms of battery) go for Dell. If you want high performing gaming laptop go for lenovo. If you want both go for higher budget.