i spent 5/6 years on a ergo4k, it was impossible for me to switch to a mech keyboard, my arms kept on crying after 1 week of regular mech layout useage. if you have an ergo keyboard def choose ergo browns, fwiw i had to mod my own ergo4k cherry brown.
This is coming from a guy who loves the ergo4k mind you, i love this keyboard, the negative slope down, the angle tilt, the awesome faux leather and wrist rest. If you love this keyboard as much as i do you might find it difficult to goto a standard 104k like i did.