This is the datasheet for the ASA55xx, and it is more up to date with the recent licensing changes in 7.2(3) - in this case with the Security Plus license for the ASA5505.
If you need a DMZ - get the SECPLUS license right away. Then count the inside hosts that need to have connections through the firewall. This will give you the number of users, i.e. 10, 50 or unlimited.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...