Need Suggestion

hi i am planning to get Alliance for my home
i reside in kolkata 700073
i have 5 mobiles 2 laptop and a pc with a DVR (ONLINE SECURITY CAMERA) presently am using BSNL and am sick of their high price and low speed therefore am looking forward to get alliance
i need review of the people using it in KOLKATA (CENTRAL)
1. Will i able to use my all devices with a WIFI ROUTER or does they have restriction on devices
2. what is the perring speed
3. my max budget is 700+TAX there which plan is best for me (UNLIMITED DAY+NIGHT)
4. How is the after sales service
5. how much time they need to install broadband
please review