I have a D5300, and was looking to switch to a FX body. I have one fx lens,a Nikon AF-S NIKKOR 28-300mm f/3.5-5.6G ED VR which replaced my dx zoom lens after it went kaput, and the 18-55 dx kit lens that came with the 5300. I had originally planned on getting a wide angle fx lens first, but the zoom went wonky on me. I was looking at a preowned body from Adorama. I have the money for either, but is the D750 worth the extra 300$.

I don't know a whole lot about the D600, but I shoot personally with D750 and AF-S lens. I bought the camera used and ever since then I have shot this camera in the rain, taken it into dusty mine shafts, and thrown it over multiple fences without any problems. It has been a true work horse and great in low light situations. For Urban Exploration I have really come to love this camera. Here are a few shots I have taken exploring with it (there is some loss of quality with the upload here tho). Hope this helps some.

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750 for sure.

Seems like the 750 has really good low light performance... looks like a 750 it is. Thanks guys

beware of the D600 oil defect!! Nikon had to replace mine because of it. Check the sensor if the shutter is throwing oil its off the hook bad!!

The D600 and D750 have nearly identical sensor (probably actually the same sensor). If you don't need the better autofocus and burst, save yourself some money and get the d600. I'm on my second one (after my first was stolen) and I use it all the time. It definitely still holds up even tho it's an older camera.