I'm a blood angels player primarily but I haven't really found any setup there that I like. A tac squad just doesn't offer me the variety I'd like. I feel like I'd have to convert more to make them feel more aesthetically pleasing to play alone. And while I like the look of a unit of sanguinary guards, 2+ ain't allowed. So I'm a bit on the fence there.
There are also some strange kill team quirks which I hope they'll iron out, like any marine within 8" of an enemy having a s6 ap4 attack due to krak. Last time I tried kill team I played against orks with a unit of death company with jump packs, and my krak grenades did all the work.
What I'm planning for now is a night lords side project so I've decided to start with a converted kill team of chaos chosen. It'll probably not be too efficient but I hope it'll look scary and make for a good narrative. Also I like the dark blue and white.