User Accounts

In using network load balancing, I have a non-AD group of servers and a
shared resource between 2 webs. All running Windows 2003 SP1.

The problem I am running into is using the shared resources off of the Share
server and managing user accounts. Throughout hundreds of websites, people
are writing to this shared resource. I contimplated setting the
Network_Services user account to the same password, hoping that it would
allow the writes to the UNC share from the web servers, but am a bit nervous
about changing any of the passwords.

Is it best to try to sync the passwords between the 3 servers or setting up
a new user account and assigning it to the share and running IIS from that
one? (seems more difficult than changing the passwords to be the same.)

I can't control where my users put code to upload files, so, I pretty much
need to sync network_services between the disconnected servers or create a
new user account and run IIS under it.

Thoughts?