help me decide

taking the following into consideration
(1)
whaterver os i seclect security is only as tight as the admin’s knowledge.
(2)
problems with known and not yet known
ipsec,authenticaion,bugs,compatibility…etc
(3)
documentation on how to’s and how come’s
(4) money !!

i have decided to skip paying cisco for a pix 515 vpn solution.
and go for a unix flavor vpn solution.
i can’t decide which flavor, I am starting
to lean towards openbsd over freebsd.
can you help me decide?
or shouldi play on the safe side and go with
cisco?

what is the tightest os out of the box?