These look like the next best alternative to Omega drivers for ATI. I'm not on ATI anymore or else I would've gladly tried them out myself. I always used to use modified nvidia drivers back in 2007, and everyone of them was awesome.
Since the HD4000 series barely improves with newer drivers, I figured you guys could use these. They are totally safe, just get the one appropriate for your setup.
---------- Post added at 01:38 ---------- Previous post was at 01:37 ----------
Oh and there's also http://www.tweakforce.com/
This is the I used back then.