Acer, ASUS, Dell, HP, Lenovo, and Samsung have all jumped on the Windows Mixed Reality train with their own brands of headset, each with slightly different specs and designs. The Samsung Odyssey is widely regarded as the most premium of the pack, with others clocking in at a lower price point. Here's every headset spec compared, head-to-head.
AndyCalling on the Windows Central forum has created an interesting discussion on the Mixed Reality headset range, and people are jumping in to explain which headset they chose and why.
As for me, I'd like to go with the Samsung headset, but alas, the company isn't releasing it in Europe for some reason. As such, I like the look of the Lenovo and HP options, but I think I'll wait to see if WMR actually hits some form of maturity before jumping in.