That will largely depend on what your site is about really. If you're an Amazon affiliate, for example, a large chunk of money might be best spent writing reviews of products and things like that. If you're an offline business, spend a lot of it on filling your site with content that will be VERY useful to your visitors while also helping you rank for geo-targeted keywords.

Adding some content for social media as well will be helpful.

I'd also recommend diversifying the types of content you post. Lots of written content of course, but also get some videos, info-graphics and things like that made (one or two of each per month is more than enough).

When it comes to long term SEO success, always think FIRST what will help your actual customers. THEN think of how you can do it in a way that the search engines will like. This will prevent you from getting 'slapped' with current or future algorithm updates.

Hope that helps a little.

Michael

With that amount I would be considering PPC, video traffic and social media.

Dont be surprised that no one will read your $2,000 content.

With 2000$/month way you should do more than SEO!

You can open PPC campaign thought AdWords, Facebook Ads, Bing!

With 2000$ PPC you could obtain more results than SEO!