Browns are a safe way to start.
Might I suggest some topre-love? The HHKB Pro 2 and the Realforce 87U / 104U are awesome boards. Topre-switch is like in-between rubberdomes and mechanical keyboards. They use a spring as well as rubber. They feel very crisp and tactily and not mushy at all. And they make the very satisfying "thock"-sound when pressed. Mmm..
I've had my eye on the NovaTouch TKL off and on throughout my searches. I need at least 87 keys and Cherry MX compatible stems. I'm just wondering how the rubber holds up to Florida heat/humidity.
That's really good question. I've looked on the box of my HHKB Pro 2 and my Realforce 87U but I could not find the operating range. In the Netherlands (or EU), the 'operating range' (temperature and humidity rangers) must be specified by law, but they are nowhere to be found.
I do not know what kind of rubber they use for Topre switches, but I could imagine that the plasticizers evaporate more easily under higher heat and thus that the Topre becomes stiff more quickly than operating under lower temperatures.
As for humidity, I think the electronics can handle that. I live in an area where is really humid in the autumn (sometimes even 75% percent in my house, that's why I now have a dehumidifier in my home) and I never experienced any issues with my HHKB.
I'm not an expert on the physics, but I could reason that the springs - which are aluminum I guess - could rust more easily in very humid environments of MX switches (depending on what is used to make them 'stainless', if they are) but less so for Topre, because the springs are covered (basically isolated) from direct contact with the air by the rubber.