There never has been a "Latin1_General_CP1_CI_AS": it is "Latin1_General_CI_AS" or "Latin1_General_100_CI_AS"
You may be confusing it with "SQL_Latin1_General_CP1_CI_AS" which is legacy, basically.
Saying that, the collation offered at setup varies based on your regional settings. See http://dba.stackexchange.com/q/7211/630SQL Server 2005 collation issue during installation for more (I've no idea why US English locale offers a "legacy" SQL collation)
SELECT * FROM ::fn_helpcollations() FH WHERE name LIKE '%Latin%_CI_AS'