Someone willing to spend $200/night in Kathmandu can get a good hotel. I would recommend Hotel Yak & Yeti. Price ranges from $79 up to $150 for Deluxe or something like that.

If you insist on $200, then I would suggest Hotel Hyatt of Tara Gaun in Boudha.It starts I think around $120 and up. Another one to consider would be Hotel Radisson in Lazimpath.

Good luck..