You have a good amount to start mining. its not wise to buy i7 laptop better to look for amd with high GPU because its more high speed than laptop i7..
This is just my suggestion.. better to build a set manually not to buy already a cpu or desktop because if you build your own you can save..
Try here maybe you can get some idea here
https://www.cryptocompare.com/mining/guides/how-to-build-an-ethereum-mining-rig/thanks alot for reply bro, and u helped me alot, i have more questions
some of my friend selling this card Msi twin frozer r9 280x 3gb at 150$
http://www.amazon.in/MSI-R9-280X-GAMING-3G/dp/B00G64H1JW?tag=googinhydr18418-21&tag=googinkenshoo-21&ascsubtag=46361708-1bd7-4010-9b87-b486c92a904dhow much power it generate?
and some more questions in this link
https://www.cryptocompare.com/mining/guides/how-to-build-an-ethereum-mining-rig nothing mention about processor which processor will best?
and can i install diffrent gpus? like 270x 280x in same system?
and with this system can i mine other coins too? or just its for only ETH coin?