Based off your question and the comment you made above I’d recommend going with apache. I cannot claim to be an expert with nginx or apache, but do know that nginx is very well known for its super fast serving of static content. Apache will get the job done just fine, and being as you said you know more about apache there is nothing wrong with going that route.
As far as load balancing….it would be my opinion based off what you’ve said to not worry about load balancing unless you have a need for it. It might be more helpful for you to increase the size/memory/etc of your server if you are experiencing an inability to keep up with demand.
Also based off what you’ve said I would take a look at what problems you see in your set up and try attack those on an individual basis. Looking at the whole set up and wanting a solution will be difficult for you and anyone helping to really give you good solid advice without knowing what specifics you are having difficulty with.
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solved Linux CentOS 6 load balancer and web server choose [closed]