Network monitoring - Very simple level with ping and text output

We are looking for something specific network monitoring wise and want to see if there is an option before we end up spending some cycles writing it.

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1. Monitor ~200 IP addresses for ping drops.
2. Ping drops are logged and counted. Thresholds can be set for alerting when x amount of pings are dropped in a row.
3. Email functionality to send when x threshold is received on dropped pings.
4. Able to perform ping sweeps every 5-10 seconds (This has been a deal breaker on most)

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Pretty simple but having problem actually getting a lightweight and always running program that can do this without a bunch of other fluff in the way (WUG, PRTG, etc). Cost isn't a very big issue right now as we are planning to replace some high cost items or end up using a lot of engineer hours to write something new. Just in the exploratory phase right now for figuring out next steps. We already have tooling for SNMP monitoring but even tuning the email portions it is WAY too noisy for our low tech skill noc.

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Thanks!