2000 visitors a day is 1.3 visitors per minute, the smallest package is more than enough.

While 2k visitors a day is not much for Nginx, php is not the same, also obviously you don’t have 1.3 visitors per minute, you have spikes of traffic and that’s what you need to take care about it. That being say you can use a small droplet, maybe 1GB if you can pay it (which I’m sure you can), but make sure to implement caching solutions to your site (Cloudflare -> Varnish -> Nignx -> PHP-FPM -> Total Cache -> WP.

Also use OPC for SQL query cache and if possible try Percona (MySQL) with innodb (no table blocking).

I have a website running wordpress with more than triple the figure running lowest plan with 512MB RAM along with 512MB Swap on Cent OS 6.5 x32 platform with zPanel..

One thing though you need to keep in mind, not all wpordpress plug-in consumes same amount of resource hence with some plug in, consuming a lot of resource, even 1000 visitor can cause trouble, where as simple, resource friendly plug-ins with server side caching turned on can allow the smallest plan to handle large amount of visitors !!

Thanks..

is 10 dollars Droplet suitable for 30k visits Monthly....