I find BSNL broadband to give the best speed for internet, I feel it even more so during peak times such as evenings when other ISPs tend to slow down a lot!
Internet speed is a good at the areas,where the network is good. In my area Reliance network is good so,i am using reliance netconnect.
Also the new schemes has came out in that. In 800 Rs, 10 GB.
SIFI net is best internet , but very much costly, if you are interested and you feel you can bare the cost then it is really best one among all the internet networks