[Staycool]

Let's assume he has the straight every time. If you push (not necessarily optimal) EV= .35(650+785)-.65(950)= -115
So if he has the straight, moving in is -EV, but not by so much. IF he will call all-in with a hand like top two,
EV= .8(650+785)-.2(950)= 958. And you've also go nice EV v combo draw, because of the $ in the pot. It's close, but I'm inclined to push.

edited to fix incorrect math!