Install of New iSeries at 5.1 or 5.2

With our new system on the way (we got tired of Rob whining about us being
back level),
the topic of install upgrade at 5.1 or 5.2 has come up. So far a great many
ways to install
have been suggested by many consultants, all detailing the difficulty in
doing so...at great
expense. What part of these scare tactics are real or imagined?

Bottom line, any suggestions from those that have gone before? Tips, tricks,
gotchas,
system values to watch out for?

To me it seems like the simplest plan is to just install the machine and
LPPs at
5.1, apply all PTFs, reconfigure the machine, script the user profiles
and dedicated devices such as outq's then just restore the user libraries
from the old box. This leaves the old box alone and productive until we get
by
the infant mortality problems with the new box and gives us adequate time
to test before going live.

Thanks in advance for any help!

Konrad