Man, 8mbps seems to be feasible in Chennai for everyone but me. :-(
The reason is for getting 8MBPS, you need to be in a distance of maximum 800 metres from the local exchance / DSLAM location ... and this depends on the area ... so this could very well be the reason.. earlier the radius limit for 8 MB was 600 mts, but now the range has increased to 800 .