What tool do you use to monitor your servers?
We've got a mix of Dell and HP servers in a colo and I'd like to have a hardware monitor so that we know about failed hardware (drives, PSU's etc.). Ideally I'd have a dashboard and I could see everything and we'd get alerts (emails, SMS, etc.) when something goes down.
I'm willing to spend money, but not 4 figure money. Ideally I'd like something that's more plug and play rather than something that I have to spend hours and hours configuring.