I look at Milenkovic as similar to Skirinar, but he's less clumsy, but same style of defender. Suffice to say, I think Skirinar is one of the most overrated defenders on the earth, he just hits people, and gets away with it (in Italy) because he plays for a big team.
Personally, I rate Bremer higher than Milenkovic, but I'm not as familiar with Bremer (just watched him this season) as I am with Milenkovic, to be fair.
From what little I've seen of Becir Omeragic, he seems very similar to Romagnoli. He has a very similar style, and while he's strong, especially for his age, he doesn't seem to have that much pace. But maybe I'm wrong about him?
Kjaer isn't slow, and I think if you look at most of our recruitment for the last two years, in general, we look for pace, and I imagine whatever defender we get next will have speed in his arsenal.