PostGreSQL for a small Desktop Application

I'm going to develop a medium sized business desktop client server
application which will be deployed mostly on small sized networks and
later eventually, hopefully, on medium sized networks.
It will probably be developed using C#.

I do need a solid DBMS wich can work with .Net framework. I do know
PostGreSQL is a good DBMS in general (it sports most of the advanced
DBMS features, transactions and stored procedure included) but i
wonder if it is suited for my application.

Knowledge base of my users is very low and "servers" will be standard
class desktop computers most probably ran on Windows XP (and Vista
later on, i suspect).
The service should be enough lightweight to be ran on such "server"
and I need silent installation and configuration because i can't
expect my user to be able to configure a DBMS.
Additionally i need a passable to good data provider to interface
PostGreSQL with .Net which possibly provide better performance than
ODBC (don't know if it exists and i hope it is free).

Anyway performance shoudn't be a big issue, i expect low concurrency
level (less than 10 users) and low to medium volume of rows and
queries. If more users and more data are needed for especially big
customer i can simply suggest bigger and dedicated server. (different
problems will arise for the aggregated data which will feed the web
application, but for these we will have a real server).

Is PostGreSQL suited for such use? If not which alternatives are there
to be used? When using PostGreSQL in such a way is there any
suggestion to be followed? Links to sources which i may find
interesting (how to make a silent install, basic hardware
requirements, so on).

Thank you!