Which graphs solution for Drupal 7 can be used to upgrade my Open Flash Chart solution from Drupal 6? I have upgraded from Drupal 6 to Drupal 7 and for me, everything is better in Drupal 7 until I hit this problem.

What I'm trying to achieve:

I have to create and show graphs to users depending on whatever the data they have stored on the site, I mean I have collected the data and stored in a Mysql database. I now have to fetch these data from that Mysql database and display it as a neat graph.

In drupal 6, making such dynamic graph is a cake walk..! I used Charts and graphs module with "Open Flash Chart" to create some very interactive and pretty graphs. But it does not has a Drupal 7 version..!

Attempting to use the 'Charts' module fails:

Then I searched for one that could work in D7 and found the charts module. It looked very promising and has a Drupal 7 version too. So I tried to install it, but I can simply not get it to work! I found a patch, but still no luck. Even if I get it to work, it will only work with Google Charts and not with Open Flash Charts or Fusion Charts because it requires those charts to be installed by us and Open Flash Charts or Fusion Charts, do not have a D7 version..!! FYI, the same problem existed in D6: when I installed everything (even Open Flash Chart API), it said "no chart plugin installed". And not even a single line of documentation is provided regarding how to install these plugins and make other charts work. Hence I think its out of the picture.

My Question(s): So what can I do now..?? How can I create graphs..? What can I use..?? 

Update about this question:

Since I didn't find any graphs module that I could use in my Drupal 7 site, I tried using an external PHP charting library "pChart". I configured everything without getting any errors or warnings, but I only get a bizarre output ...

I have explained everything in detail, along with the code I have used to create the graph in my (new) question What is causing the unusual output when trying to create charts in Drupal 7 using the pChart library? Any help to answer that new question would be greatly appreciated!
I've used highcharts script before, not with this module, but it might work for you http://drupal.org/project/highcharts