asterisk users - Sep 2009 - "Switchboard"/"advanced answering machine setup" with Asterisk?

Hi,

I'm a "noob" to Asterisk and this list so I apologize if I'm
out of
place with my questions.

I'm planning to utilise Asterisk to build a "switchboard" (of
sorts)
with it and was wondering if this would be feasible (from what I've read
about Asterisk it seems possible). What I would like to achieve:

All analog calls routed through Asterisk. Callers will need a login pin
code to progress (preferably a unique pin code for each caller that I
can give out). If I'm unable to answer, the caller should be able to
make various choices (i.e. leave a message etc.).

Is this possible?

I was thinking to utilise a low power VIA mini-itx or something like
that. Would a card like this be appropriate for my purpose?:
http://www.digium.com/en/products/analog/tdm410.php

Also, I'm living in Sweden and I was wondering where I could buy digium
cards?

Any tips, recommendations are welcome!

Best regards

Peter K