Having stayed with Sify for more than 3-4 years.....I have finally decided to move for MTNL tribandI have applied for 590NU plan with modem. or should i buy my own modem.....how much does an ADSL modem cost.Is it worth giving a Rs 500 non refundable security and Rs 50 pm or should I buy my own CPE.Also How long does it take for them to install the connection. I wanted to get it installed in JAN as I am pretty busy these days but applied today as they have waived off installation , testing and 1st month rental till 22nd dec.Is there anything like a specific model or brand of modem that i should ask them