Keyboard- Steelseries Merc Stealth- Steelseries Merc Stealth Keyboard | Keyboard | Flipkart.com
Mouse- Steelseries Kinzu v2 pro edition, steelseries kana or just go with Logitech g400. Deathadder's teflon feet are too small and they wear off in few months. If you want to go for laser then go for either Roccat Kone or Steelseries Sensei. Although i would advice you to stick with optical.
1) Kinzu v2 pro edition- *www.infibeam.com/Accessories/i-SteelSeries-Kinzu-V2-Pro-Mouse/P-M-GA-62016.html?id=Black
2)Steelseries Kana- *www.ebay.in/itm/SteelSeries-Kana-G...3?pt=LH_DefaultDomain_203&hash=item3378360571
3)Logitech g400- *www.flipkart.com/logitech-optical-...FZBG&ref=e7cc904e-7461-4827-811f-8e9c0aafb75c
Mouse Pad- Steelseries Qck+( any edition). For laser you should go with hard mats although for me QCK heavy does a wonderful job. *www.flipkart.com/steelseries-qck-l...G4SG&ref=a3287a13-a569-4585-9fe5-c06feff441f8
Even after these 3 buys you will be saving 1-1.5 on your budget. Merc is a great keyboard with every feature that a gaming keyboard should have. Steelseries QCK+ is a great pad but its size can be a problem. Its huge and if you don't have alot of space on your table then better to go for something like Razer Goliathus(standard size). As for my mouse suggestions I personally would have gone for Kana over g400 and Logitech g400 over deathadder. Deathadder has really tiny teflon feet and if there is even a little bit of moisture on your pad(which is inevitable unless your pc is in 24/7 AC room) controlling DA becomes rather difficult. Steelseries RMA is good as well, I have got my Xai replaced twice in 6 months

(Xai is not worth it I know

- learned it the hard way)