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Thanks, right now low budget fullframe camera - Canon 6D, couple of lenses and filter sets... :).
If I can recommend something, I don't know how big is Your budget, but take a close look for all mirrorless cameras which hit the market some time ago - great option, I think my next camera will be something in mirrorless technology.

I would like to stay with Nikon and I'm thinking about D750. I wanted to get D850 but it's very expensive and I've heard that I should invest into the lenses instead of the body. I'm not sure but I have to decide quickly...