My advice to you is to leave your machine alone and to just
learn it well.
You can always update the software in the future, once you get
some experience on your unit.
The safest known update will depend on what accessories you have
(360, Ipilot, Radar, XM Weather). Only people who have had experience
with a bad update are going to know which is the safest update for their particular unit and accessories.
Chill out on the updates and just enjoy your new machine for awhile.