It depends. Right now, he's probably top 5. That's on a hot streak, though.
Until he sustains this play, he's behind Nash, Zetterberg (when he plays there), D. Sedin, James Neal, Evander Kane, Loui Eriksson, Taylor Hall, Patrick Sharp, Pacioretty, Parise, Moulson, Elias, Kunitz, Vanek, Landeskog, Tanguay, Andrew Ladd, Brad Marchand, van Riemsdyk, Ray Whitney, Jeff Skinner, Jussi Jokinen, and Lucic.
So I'd say top 30. That's a very good player, and he could definitely move past a lot of those guys.