hi, i've dataone conn. with modem of type 3 on rent, now i want to buy a modem (which should b cheap and best)so that later i can switch over to other conns. also.should i go for type 1 modem which is being provided by bsnl or should i buy a modem from the market.pls suggest.also if i've to buy it from the market,which modem should i go for..thank u