Upgrading NPM server to Win 2008?

We are looking at upgrading our NPM front end server to Wndows 2008 and I just want to know if there are  any caveats I need to be aware of before I give the ok to proceed. Our current setup is:

Windows server 2003 R2

NPM SLX v10.4.2

NCM 500 v7.1.1 (Running on separate server in Integration mode)

VNQM SLX v4.0.1

IPAM 16000 v3.1.1

NTA SLX v3.10.0

Kiwi Syslog

SQL Server:

Windows 2003 R2

SQL Server 2005

Will likely upgrade the SQL server as well once NPM server is complete.

Anything I should look out for? Or reasons not to upgrade? Should I install clean vs upgrade?

Thanks for your input!