This is a very much a personal thing. What fits others may not be of your liking.
Everybody rave about mechanical (long key travel) keyboards, I personally don't know why. I used mech keyboard in the past. Yeah don't get membranes, they are spongy but I got used to thin scissor (thin) switches, like the Dell am using at work is perfectly fine and I can type on it all day.
Are you a fast typists? Look for large space bar, Enter, Backspace. Shift keys 'cuz u will be using those a lot.