I agree with misch. I use nedi for the discovery and inventory, config backup, etc. But zabbix is far more granular as a monitoring tool. I use zabbix to snmp monitor in realtime, (as opposed to the 1 hour nedi discovery). Zabbix is what I use to generate alerts, escalations, outages, etc.
Was thinking of starting a project nedi2zabbix which would dump device list of the nedi DB and import to zabbix using some type of standard monitoring templates depending on the device. I've already written some stuff in ruby to do a similar task where it dumped virtual servers and application pools from F5 LTM's and imported into zabbix using the ruby lib zbxapi. I don't think it would be too difficult to do similar export from nedi into zabbix.
Right now I'm in a new job and I've used nedi to get inventory and control over 200+ devices. I want to take it a step further and get those devices into zabbix for operational monitoring. I could just labor through importing 200+ devices to zabbix manually but I think it would be much more interesting and useful to the community to created an automated tool to do the work. First iteration would be very basic and just import all nedi devices into zabbix with some very basic monitors like cpu, mem, interface stats (errors, discards, traffic in, traffic out) and some thresholds and alerts.