Charting Library (PHP)

Looking for a nice charting library that can integrate closely with PHP, prefer object oriented. Flash or Non-Flash based. I would prefer static images, but Flash offers nice eye candy. I just need the basics; line, bar, pie, with labels, keys, and coloring options.

I am looking at Open Flash Charts, but the download comes with a lot of files, and seems very bloated.

Also looking at Google Charts, but again looks a little nasty to use.

What have you all used and liked? Thanks.