Finnish has 16, Estonian 14. Though most inflections can be derived via suffixes from about 4 of them (3 singular, 1 plural), What's probably complicated is when to use the correct form.
Circle Of Dust Celldweller Brainchild Angeldust Argyle Park Scandroid Immortal (USA) The Way Sect Bloom Chatterbox Blue Stahli Seamless Squarehead Subkulture Fluffy Star M.O.V.E Tommy Noble