I like ardour and i believe you can use reaper now as well, though reaper is more like shareware at 65 bucks. What are you trying to record? Beats or instruments or singing? Do you have an interface yet? I like the tascam 16 channel, or the presonus audiobox for price and value. My buddy actually recorded a whole album in Linux, the painful birth of Nehemiah st Danger, check it out.