#1 has a universal look and I like that. When considering printing it on letterhead or stationary I do not want it to be too long yet I want it to be large enough to be easily seen.
#2 is interesting but still has the acronym issue. (pis)
#3 is interesting as well but seems blocky
#4 Just doesn't catch my eye.
Is it possible I am looking for a more legal or contractual look?