BSNL Wifi Broadband modem / router query


Hi. I currently have a BSNL wifi modem / router at home. However, the wifi signal is really weak and I wanted the unit to be changed. However, the BSNL exchange does not have any new units and have advised I buy a ADSL WIFI modem for Rs.1800 from one of the BSNL dealers. Below are my queries1. Is this a good modem for BSNL wifi (the ADSL Wifi for Rs.800)? They have another one callled ADSL wifi TA WOIP modem. Whats the difference?2. Is it better to buy a modem like netgear or asus etc (other than BSNL store modem). Would it work with a BSNL net connection and if so, is it can you recommend a few options (brands / model / approx price).Thanks,Victor