What do you mean by "utilities"? You mean GUIs? Commands?
The SUNWCreq cluster gives full multi-user, network functionality to the box. After that, you need to decide what you want installed depending on your usage.
Here are some clusters and packages that do not install with SUNWCreq that I find essential in my particular situation:
You should change the title of your thread, and instead of asking for a lean installation, ask how to get these commands and tools you are referring to.
I am trying to figure out what process some folks are using when they install to have the functionality they desire (commands, security, etc..).
I am looking for a lean install but with at least some of the basic commands installed( ssh, scp, ipf, fetch...etc...).
So what software group do you choose (reduced network, core, end user, developer etc...) and then do you install extra packages during the install process or do it all post install?
If you do your package install post os install do you re-mount the cd and install from there or download from other places then install?
Sorry if I am not making sense I don't really know how else to ask this question.
Maybe can take a leaf from NSA System configuration Guides http://www.nsa.gov/snac/downloads_all.cfm lots of very excellent information on hardening different types of OS's application, email & databases.