there was a BSNL mela a week back you could ahve got router cum ADSL model which BSNL gives generally in low price, it is a good router.
DLink's GLB-502T(priced upto 2-2.5K) and routers upto this level are just enough for normal usage, giving a radius of 10-20 meters, have lesser rate of data transfer for LAN, higher routers which almost price 3.5-5K give better wireless LAN.
I do not think building a string wireless LAN is your requirement, but for net, as Sorcerer said, keep a check of models which act both as router+adsl model if you do not have adsl modem otherwise just a simple router will be good.