i don't think shrimp have huge bio loads so if you want something quiet and cheap, the hagen hush series are pretty good. they're super quiet, come with a sponge cartridge and a carbon cartridge. the sponge cartridge age never needs to be replaced, just cleaned and you can remove the carbon cartridge so you can have room for an ammonia and nitrite reducer.
however, if you want something better, there's always the tetra whisper ex series which are very cost efficient because you can get a pack of 4 filters for 20 bux (cdn)...so that's 4 months for 20 bux!
and ultimately, everyone's favorite, the hagen aqua clear series seems to be top of the line.