Having actually used OBS a bit now, I can say that it really does work great, and is the first screen cap software I've tried (including fraps, which used to work) that is able to capture 60fps gameplay with dropping frames. That it encodes on the fly into h264 is even better. And while it's very powerful and flexible, it's dead easy to use and understand (often the weak point of open source).
sqiddster
You have an SSD and an i5/i7 right? Just go to 'encoding' and set the bitrate really high, like 25,000, 30,000 or 50,000. The quality will still be really, really good...enough for promo videos, and overkill for youtube. Better than capturing a microscopically sharper image with another program that lags and drops frames.