im feeling a little conflicted about some of my armies

i love chaos space marines but i also love the imperial fists. which is why i have the idea of making a chaos space marine warband in imperial fist colors since a somewhat grungy yellow and black color would work really well with how i see it. though at the same time, i absolutely love the imperial fist models, especially from HH.

the way id make the space marines would be mixing the old IF torso, helmet and shoulder pauldron upgrades from forge world with the old tactical squad.

so now im a little conflicted with what army i should make. im not asking everyone to outright decide for me. but i would like some insight on it