Not sure I would make this deal. I'm assuming you get to keep your prospects, and I'm quite high on Grigorenko, so losing him in this deal isn't something I would enjoy.
I like Parise over Semin. It doesn't look like you would be keeping Faulk, thus I don't think he makes enough of a difference to swap Parise for Semin, and lose a top notch prospect in Grigorenko, and a solid D prospect in Elliott.
For you I think you have to look at it, as how well you think Semin can do in Carolina, and if you believe he will be the Semin of old in Carolina, than go for it, if not I'd stick with Parise.