Push for a larger discount, eventually when he gets stock he'll give you something like 15~20% off. I had ordered a sennheiser hd555 from him...
Also sennheiser has opened operations in India, in Delhi, not sure of the address or contacts. Pls do try to contact them for prices too.
^^If getting from the US (in lieu of how easy it is) get the HD600 which should with a good amp and cabling beat the HD580 or equal them. Hardware is the same I think, maybe a few tweaks though the HD600 is carbon fibre (at least the cups). Do check, I read up on this awhile back when deciding on my cans.