i just want to add some one of my thoughts about keybord and mouse as the 'upgrades' for q3. my opinion is - thet mouse or keybord its like 20% of overall that makes player a good one, the last 80% is practice.
sorry for little offtopic.

well keyboard has to be good in one way I know. the buttons must be easy to press, so they dont get stuck once in a while. sometimes I mash the keyboard buttons very hard and its quite shitty especially on laptop keyboards, that the buttons eventually start falling out and and the rubber underneath they key gets worn out.
so yeah, keys must be easy to press and they dont get stuck, thats kind of the main thing about how good must be the keyboard, in my opinion

Also like Gabber mentioned, wireless stuff isnt good for gaming, stick to wires, it might be good that for example wireless mouse doesnt get tangled when you're trying to do a fast 180° drag, but as far as I can tell batteries eventually run out and it lowers the response rate from mouse to pc.

23+ years Alps mechanical keyboard with ps2 adapter, works gr8.

i have a like 10€ keyboard, cheapest i could get in that store. i'd say for q3 there really isn't any need to buy an expensive one, i dont understand why there are expensive ones anyways. i saw a 300euro keyboard in my local store and i rly dont get it, mb for stuff like dota2 or sth?

Keyboard is worthless for me if it is unable to read more than 3 buttons at same time. When i wanna go in upright direction, jump, change weapon in air, i don't wanna get stuck. Also i got those 2 binds.Alt = walkingTab = plasmagunAnd when i push those 2 together i minimize window :Eeee grrrMy keyboard has an option to block this alt+ tab function, which I find mandatory.

Logitech G-somethingsomething, dunno which model it was, but it was big Ass solid piece off keyboard. Very responsive, many cool functions...

And secondly Razer Lycosa, smooth design, responsive, light weight, overall good plastic awesomeness feeling. Xd but rubber buttons are not durable at all.