Default Help

Hi all i got a questions i have a att note 3 rooted and i have SS installed i was running MJ5 build but with the small OTA update its now NB4 I can't get the new Kitkat since it fails at 27% and honestly am quite happy with jelly bean 4.3. my question is i would like to flash a custom ROM, but am not sure if i can flash MJ5 or do i only have to flash NB4 ROMs? in other words i want a custom ROM compatible with my phone but don't want to loose root just not sure which is compatible. and will it trip the Knox counter? thank you