The Oculus Rift S is inexpensive enough that we could start there and upgrade to HTC once full Enscape compatibility becomes available.
I have said it before and i will say it again, I dont quite understand this misconception that the Cosmos is a superior HMD to the Rift S.
Just because it is priced higher does not mean it is a better, it just means HTC needs bigger margins!
True, the resolution and refresh rate is higher on Cosmos but that also stresses your gpu a lot more, which mean you will have to lower the settings in Enscape. On the other hand, the Rift S has superior fit, better optics and way better controllers, all of which cost nothing in GPU overhead.
So even if you dont take price into consideration, Rift S has the better tradeoffs imo.