exit polls are useless.
In most cases, exit polls have proved to be inaccurate.
I think markets will ignore all predictions and wait for the actual results to be declared.
the best thing that can happen for the markets is that NDA comes to power.
next best thing would be UPA in power,
without the communists.
worst would be third front coming to power.
UPA or NDA coming to power are both positive for the long-term.
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in the short-term, here is my opinion...

..if
-NDA gets 50% seats or comes close to it.....Nifty will open 200+.
-UPA (minus communists) gets 50% seats or comes close to it....Nifty will open 150+.
-Third Front gets 35%+ seats....Nifty will open 100-.
-Third Front (non-NDA + non-UPA parties) gets 50% seats or comes close to it.....Nifty will open 200-.
-Communists + BSP + all those socialist parties get 50% seats....Nifty will open circuit down and halve in 3 days flat.