The Nima arm manual states an acceptable cartridge weight of 5 to 12 grams, so you have quite a wide range to work with. I'm a huge Dynavector fan, and would strongly suggest the DV Karat 17 as a possible contender at the top of your price range. However, the 17 has a mass of 5.3 grams and just because the manual says it's compatible that doesn't make it so. Tried one with my Graham and couldn't get it to balance even though the Graham manual clearly stated 5 grams was OK. Maybe look for something in the 8 gram range to be safe? Your call either way.
Good luck & happy listening!
Good luck & happy listening!