Possible big project need help to figure out who fights whom

So,

I have a dream, ambitious and costly.

I need help figuring out which of the 9 Loyalists would fight the 9 Traitors in 1 v 1

i.e.

Sanguinius vs Horus (obvious story reasons)
Russ vs Magnus (a real back breaker of a reason)
Fulgrim vs Ferrus (a sad tale)

I need a hand with the rest. My lore is a bit rusty as are my painting skills. Been 20 yrs since i painted and started back up in Jan. Looking to invest time and money into a project that will become a set of display dioramas on a set of 9 shelves.

Any help appreciated.