Which driver to use for ATI on Natty - HP Pavilion dv6

I get the following output from lspci, trying to figure out what graphics card(s) I have:

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: ATI Technologies Inc NI Seymour [AMD Radeon HD 6470M]

By default, I'm not sure which card is used by Natty, but it's an open source driver (I'm pretty sure).
At the moment, I seem to be running the radeon driver:

$ lsmod|grep radeon
radeon 982197 1
ttm 76664 1 radeon
drm_kms_helper 42136 2 i915,radeon
drm 227495 6 i915,radeon,ttm,drm_kms_helper
i2c_algo_bit 13400 2 i915,radeon

With the current driver I experience various freeze problems:
* Sometimes the computer won't boot, it just hangs before the login screen appears. When this happens, it is usually a complete freeze - forcing a reboot. On rare occasions, the freeze is only on the graphics screen, so I can Alt-F2 to get to a terminal
* Frequently the machine will freeze, while I'm logged in. When this happens, it is usually a complete freeze - forcing a reboot. On rare occasions, the freeze is only on the graphics screen, so I can Alt-F2 to get to a terminal and kill compiz - and then continue as if the freeze hadn't happened.

Apart from the freeze problems, the radeon driver seems to work fine. Unity is working, and I can watch videos.

The "Additional Drivers" applet offers to install a binary ATI driver, but when I do, Unity complains that it doesn't have necessary resources. To bring some more clarity, I'm now trying again to run the binary drivers. Something is clearly wrong, because this is what I get:

$ fgl_glxgears
Using GLX_SGIX_pbuffer
Segmentation fault

$ fglrxinfo
Segmentation fault

I found the following page, listing the different driver options: http://wiki.cchtml.com/index.php/Ubuntu_Natty_Installation_Guide

My question is simply - which driver should I use for the best experience, for this laptop?
And the follow-up would be, how do I go about installing/configuring that?