Some really nice observations there. I found 10.04 really troublesome to use but probably because I installed offline and without everything plugged in. The most frustrating thing about it was non-recognition of my 24" Benq monitor, and the refusal to download and install drivers for the Radeon HD 6850, nor to detect it and update through the updater/drivers tool.
So I wondered if upgrading to the latest version, whilst connected to the internet might help matters and it seems to have.
Since installing ubuntu I have been reading some linux information online which points to the latest edition of mint being the more user friendly and all-round best linux distro for ex-windows departees. For now I'm getting on reasonably well with ubuntu but if I have any showstoppers I might try mint before I run back to billy gates with my tail between my legs.
Download the drivers from the ati site and unzip them in the same directory then in the terminal you want go into your downloads directory
cd Downloads
now run the installers using
sudo sh "name of installer"
enter your password and it will run the installer. Just do a normal install like anything in windows and then reboot. You now have your 6850 working.
You can always wait for ubuntu 12.10 to come out in October as this will carry kernal 3.5 and there is a lot of support for newer gfx cards too.