Try a refurbished Sputnik and do medium format 3D. It isn't much larger than a Realist and the results on chrome film will literally take your breath away. Amazing. There is no point to 35MM 3D once you've seen it in MF. If you aren't looking to tinker try the 3D World MF camera. My 2 cents.
I spoke about this in detail in a recent Inside Analog Photo podcast if you are interested.