Have anyone switched already?
Well it depends on a lot of factors.
Do you have 4 or 8 GB gpus.
What is you energy price.
Nvidia or AMD.
Well if you have cheap energy and good PSU i would try Ravecoin.
If you have a high energy price and weak PSU i would try XHV.
If you have just 8 GB cards may be DBIX. (If you sell it at the right time it is very profitable)
But i am just a hobby Miner. I would be also interesting what professional miners have as plan B.