Does anyone know of a stock photo resource that offers high-res watermarked comp(preview) images?
Creating mock-ups with the tiny comps that getty provides really dials back the look of the mockups.
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Dreamstime offer the largest watermarked thumbnails of any of the microstock sites I have come across. http://www.dreamstime.com/
You can use free alternatives. There is a lot of quality ones coming to the fore. I suggest unsplash.com.
Of course, these such sites might not have the breadth and volume of imagery you need. These can be a brilliant alternative when you're looking for more atmospheric imagery. They are high quality and have no restrictions - you get the full, high res image immediately with no watermark and no need to provide attribution, even for commercial work.
Be sure to check sites like this if you're not looking for anything too specific.