For $50 you'll not get anything worth smoking. Given that you'll spend several hundred dollars on shisha and coals within the year it makes no sense to save on a narghile. Drop Jimmy a line at J & R or check out www.furathookahs.com
and you'll wind up with something that will serve well for years. If you go with Furat remember you'll need to get a brass hose barb at home depot to change the head config. from Syrian to the normal Egyptian setup. It'll set you back about $4.