My primary mechanical keyboard that I've been using for a while is starting to go a little flakey on me, even after a few rounds of cleaning, so I'm looking to finally replace it. I'm looking for something:

With fully mechanical keys (replaceable switches would be a nice bonus)
Ergonomic layout, which these days seems to primarily mean a split design
Illuminated keycaps would be preferred

Anyone have good recommendations they can share?

- Frank