I have never heard about having to leave the modem on all the time to sort itself out befor! The adsl mode you have at the moment should be fine. My preferance is for router filewall combos as they offer more protection from hackers and worms iv discovered. Befor i got my first one my software firewall was going of constantly but now with my hardware one in place i hant had anything for months. Be warned though just because you have a hardware 1 dont meen u dont need a software one aswell as hardware only protects agint incomming and not outgoing!!!!!!