I have no first hand experience with the Niagara series but have researched them pretty extensively. My understanding is that the 1000 provides some basic protection and filtering but that the 5000 operates at an entirely different level. So going from the 1000 to 5000 should be a pretty significant sonic upgrade (to us audiophiles.) Power devices can be quite dependent upon the specific gear connected as well as the quality of your incoming power, so I'd strongly suggest an in home audition of the 5000 to ensure that the level of improvement in your system justifies the expense. It really doesn't matter how it performs for others, the only way to know for sure is to hear it in your system. So either a dealer you have an established relationship with that can loan you a demo or sell you a 5000 with a money back evaluation period would serve you well. Good luck and please keep us informed whatever you decide.
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