Configuration is not tough at all. You just have to enter 4-5 values. VCI is 32. Mode is PPPoA/PPPoE, username and password are your telephone number and CA number respectively. I have actually ordered the TP-Link model I mentioned above yesterday, it should arrive in a day or two. I'll let you know about configuring an MTNL connection by yourself and what range you get(should be similar for D-Link and Linksys). Be warned though, some people on flipkart that setting up that D Link router is slightly tough as the options/menus it has are confusing.I have no idea whether the 450TC1 would support a repeater but since its a g network based one, i think it makes more sense to upgrade. Plus, you have the modem rental too so you'll recover the cost eventually. Unfortunately, its not possible to give a concrete value for the range. it may depend on a lot of factors like the thickness of walls, shape and design of the house, interference from other wireless signals.