the red sea prizm is supposed to be pretty good for about $75
most people i have heard from havent had much luck with skilters, but i have no personal experience
i really think a good skimmer is something you dont want to skimp on. as s.reef mentioned, live rock, lights, and a skimmer are the essentials and a good skimmer will save you tons of headache
i would reconsider the $100 maximum budget
oh...and no skimmer is going to be silent...reefs make a little noise, its just life