How to create an efficient download statistics of files hosted with nginx

My problem

I have a debian squeeze installation running nginx as my webserver and handling PHP5 requests using php-fpm, which works fine. I have one directory, which holds static zip files of a program in different versions. What I would like to have is a nice download statistics about which file was downloaded how often. I am not sure what would be the best way to implement it. I have set up a separate location block in my configuration file to log these downloads separately.

Acquiring raw data

For the acquisition of the raw data, meaning the download numbers I have two possibilities in mind:

1. Using a script written in perl to parse the log files on a regular basis.
2. Using the post_action directive in my separate location block to trigger a logging script when the download has finished.

Processing the data

To process and log the data I could imaging using different tools:

1. Store the values like filename and download times in a sqlite database and read data from there.
2. Use rrdtool to directly store the data in a round-robin manner which would also make generating graphs very easy.

There is another possibility of making all the above steps obsolete, but I do not know if it could work out. I am using google analytics for this site, could I somehow log these download numbers with this? By doing this I would not have to implement anything.