Importing Laptop from the USA via Borderlinx or ShopAndShop and custom duty/tax

Hello,

I want to import a laptop from the USA.I need a laptop for my multimedia work,video editing and rendering.So I need high-end CPU,GPU and more RAM for that and these type of systems go beyond 1 lakh here.

I'm researching on American websites for last few days and the prices are comparatively too low there.I can find system fullfiling my all requirements costing around $1200(Rs. 76000-as todays' conversion rate) there.The same system costs me here around 1.2lakh(MSI).

There is no-one to carry it for me here so I've decided to import it here via any package forwarding services.
I came across these 2 services : Borderlinx,ShopAndShip

I used their calculater and other duty calculator,and even after adding all custom duty/tax+shipping it costs me in Rs.90000.

I have these questions:-

1)Has anyone ever imported laptop using these 2 or any package forwarding service ? How was the experience?
2)Is the estimated cost of custom duty/tax+shipping is around the actual custom duty/tax and shipping ?
3)Insurance of my product ?
4)What about the warranty of purcahsed laptop imported in India ?

Thank you