linux - Server monitoring tool for Nginx+Apache+wsgi+django

I'm running website on Ubuntu server with following chains:
Web server - Nginx+Apache(worker)+mod_wsgi+django

Background workers - celery, rabbitmq
DBs - mysql, mongo

I'm looking for a best ( and simple to deploy ) server monitoring tool with web interface. I've checked several of them - zabbix, monit and some other. It seems all of them are on PHP and thus require Apache to be in prefork mode.
I found no installation tips for nginx, so my questions are:
1) Which tool may be preferred for monitoring most of my env
2) Please point on most simple tool to deploy on nginx or apache-worker

Thanks