I'm in the market for two chairs for our office. They're primarily for sitting at the computer, sometimes for several hours. Should I get ones with arms or without? Do the arms get in the way of the keyboard drawer, do you find you use them to actually rest on? Of course if we get armed ones, they'll have to be adjustable which means $$$s! Any good looking, decent priced, eurgonomic computer chairs out there? They're all so ugly.