That is what the OP used to have until he decided to get smart and combine the two.modem + router separately, always!
@dinjo - i have a zyxel lying around - pretty good. I have used tp link as well - pretty good! You cant go wrong with either, but TP-Link would be my choice...
Asus RTN16 still kicks ass....
that will be extremely rare as most ADSL chipset code are proprietary.DD WRT has started supporting ADSL routers
@vivek.krishnan - Did you actually got a gigabit router for yourself ?
I'm currently using a very old modem router which i was able to find from somewhere at my house , plan to travel to Lamington today and get RT N15U or RT N16 though I'm still undecided on router