what could i proxy as knightly space marines?

im making a custom chapter that is knight themed but idk any good bits sellers(physical) or just other minis that look like knights, i really like how the emp champion looks so he gonna be my warlord so im looking for something that looks similar(sleek and slimmer). im also a tad bit demented on whether or not i should run them as dark angels or black Templar, since with Templar i get access to the emperors champion rules but with dark angels i get access to deathwing knights.