Nothing is 100% bug-free (even official Samsung builds).. but for the least bug-free experience... avoid KitKat roms. Some are good, no doubt, but still have more bugs than those based on official 4.3 firmware.
Good ones mentioned already... my vote are for Hurricane and Revolution HD - but always read up on each thread to see what bugs are present (to see if you can live with them).
If you need help, check the FAQ first for whatever ROM you're on. Then ask questions.