Slighty OT: Are you the guy from djf that wanted to hook up extra 1Ds to the 4D for the true 4 deck mixing experience? If so, how did that work out (pls PM me).
In regards to the mixer question, I'm pretty much at the same spot. I've decided to go for a DJ mixer, it's just not as cramped and frees up controls on whatever controller you're using for much more interesting stuff

Since I also do streaming radio stuff, I'm currently totally in love with the DJM700 (has XLR mic on top, can put FX on mic channel if needed), along with just 4 Xone 1D for a really nice superknob/"superbutton" four deck setup with as little shift-ing as humanly possible (it really annoys me, soft takeover also just is a really poor workaround /endrant). Everything still in the works though

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