If you have a reasonably-priced source of Schiit gear in Mumbai, maybe you should consider getting a Magni for the DT48s. It is said to be similar to the O2 in performance terms (or get a Vali for a little tube flavour combined with a powerful solid-state output stage).
Ah man, HiFi stuff in India is almost impossible to find.
Although I am saving up for a Violectric HPA-V200 as a reference SS.