advent and industrylizer are stand out producers for me at the moment, but then again, cisco's stuff always stood out so it doesnt meet the requirements of the question heheh

nuccle and h for sure, that was one hell of a collab but i've heard them both do amazing stuff on their own.

speedy and liebing.. that really works but again, they're good separate too.

what you're really asking i think is what partnership in a 'band name' works well when together but SHIT when they're apart. cause tbh when ppl like speedy and chris and the rest come together, it's because they were already good anyway.

and you know what...

I CANT THINK OF ANYONE HAHAHHA