I had this EXACT same question earlier this year, and I ended up going with the AF-S 35mm 1.8. Not only was the price a big drawing point, but also the 50mm is just a bit too cropped... especially since the main reason I wanted the f/1.8 is for indoor shots with bad light so I don't have to bump up the ISO. In a small/medium sized room, that 50mm is going to limit your shots because of that tight crop.
I bought the 35mm f/1.8 and am IN LOVE with it. And it's fabulous for portraits too! That's my recommendation!
