Ignoring price, the best keyboard option for me, for work, is the Realforce 87U low noise, then regular 87U variable, then 91U. Kinesis Advantage and HHKBP2, get to duke it out for next best.
Not having had a month test drive on Kinesis or HHKB, I do have concerns that I might not prefer their layout, at which point I've made an expensive mistake. At least Kinesis has a good return policy.
The Realforce and Kinesis might be too big for me to lock up in my file cabinet. Thankfully, I can figure this out before purchase, but I haven't bothered, since I can't afford it. I'd have to make some room, just for the HHKB. Considering their costs, not being able to protect my investment is an issue.
Health, responsibilities, budget - all things considered, I suspect, I'll be picking up a tenkeyless brown board, when I'm able or a deal pops up, which will solve my health needs. The difference in cost, even if just spending the money on recreational activities is significant.
If I'm going to pay $300 (HHKB +tax and shipping) to 400 plus for a keyboard, then it needs to check off the majority of my desired features, especially functional ones to be necessary or have made it into my top ten list of wanted items.