I compared a lot of posts grid plugin. Gosign is the only one I found with a navigation menu to select posts from a specific category. And for the rest, it does the job with for instance a nice masonry display.
If in the future you could develop some features such as support custom post types and navigate through posts using tags, it would be wonderful !
Just a small point: on my dev site, there are some php notices regarding “Undefined index”. It’s easy to fix with isset() 🙂