Actually, I don't think anyone will buy Tesla for themselves(Unless they are totally into research and have a huge government grants). It took my University four months to decide if they want to buy Teslas or not.
In the end they did, and it was like 30L ? for 12 of them.
Let me tell you the Typical scenario we follow with Tesla. I use a Windows tablet, upload the task remotely to a Tesla server, wait for a while and then view the result directly on my tablet. Efficient. Fast. Convenient. (Also, they now considering nvidia GRID servers).
Second thing, Tesla will never work with Thunderbolt port, trust me, when you work with Tesla, you don't want any intermediate between CPU/Chipset/Bridge and GPU, their are driver issues, and simply, it has never been tried before I guess.
Thunderbolt port has no utility unless you are willing to spend large amount of money on Thunderbolt port certified peripherals , and even Displayport can daisy chain displays. Or unless you want to use custom cards from AVID and RED...(or an external gpu solution xD ).
Edit: To the thread starter, if you really want an upgradable system which is present in India, go for Alienware 17 base model present in India. 145K with 860M. Standard MXM slot with accidental damage protection and 1 year warranty.