Using FX lenses on a D800 (with crop factor) + Video

I found a D800 with 95,000 shutter counts for $1100 cad (863 USD). I own a d7100 with several DX lenses. Long story short I am going to Iran to film and take pictures for several months. I'm on a tight budget. I want to use the D800 for videos and wide angle photography. While using some of my DX lenses on the full frame camera with the 1.2 crop factor and still get 25 megapixels image. I would take the D7100 with me as well.These are my DX lenses:17-50mm Sigma 2.870-300mm Tamron VC35mm 1.8Pending purchase:Tokina 11-16 2.8What are your thoughts on this strategy? Should I just stick with the d7100 and use it for video and photography or should I pay the extra grand, use both tools and maybe sell the d800 once I'm done.Hell, is it even worth getting a camera with 95k for that price? All other d800 were listed for +1,600 cad(1250 usd).Thanks in advance. via /r/photography http://ift.tt/2vVmb1O