I found a rather handy little program that I found very helpful to update ACE and some other mods that are popular.
Its called Yoma Toolshttp://dev-heaven.net/projects/list_files/yoma-addonsync2009
I personally found the Six Updater a bit of a pain as I could not gauge upfront how much need to be updated.
Yoma gave me a graphical interface so I have an idea what exactly it going to replace.
You can also launch ARMA from the program with the correct mods enabled.
Though I only really use Yoma for its update capability.
It does have a very nice server browser so you can see what mods are being used instantly.
And you can also filter by country which is always handy for us.
To launch ARMA I use ARMAII launcherhttp://www.armaholic.com/page.php?id=6649
Neat little program that allow you to setup multiple profiles.
Also has the ability to prioritise your mods in sequence.