I've just rooted my s3 so may aswel start the ball rolling for anyone else who's looking to do so and not sure of the process.
I followed the guides for recovery and superuser
here -
http://forum.xda-developers.com/showthread.php?t=1684535
and here -
http://forum.xda-developers.com/showthread.php?t=1538053
Omega v3.0 is the only rom that appears to be out at present but Im not sure If i'll flash it. Theres hardly any bloat on my handset so Im more interested in installing Titanium backup and freezing/removing any of the junk that I dont want on it for the time being.