Write some Software and Build Site

I am wondering how much money it would cost to develop a web monitoring service. We would need a few things in no particular order: 1) A site that allows people to sign up and register for the service. They would be able to then view their dashboard and add different sites that they want monitored. They would be able to switch between the sites and view a graph with uptime and any date that the site may have been down. They would be able to switch sites to view this info via a drop-down menu. We would use [login to view URL] for the line graph. 2) We would need a script to run complex checks to make sure its not a false positive. We would ping the site every 5 minutes to make sure its up. We need to be careful to code this properly so that we don't use excessive CPU power on the server. We need to keep costs down. 3) We would need an email notification service that alerts a user when their site is down and when it is back up. The user will also get a monthly report with a graph and any dates or times the site was down. We can borrow some code from the open source Jetpack module called Monitor. [login to view URL] This might be too complex. Let me know how much you can do