I feel a little out of the loop here.. but.. I'm building a pure FreeBSD box no CP's (FreeBSD 5.3)

What is safe to run and not..? (and I want best compatibility/low issues I suppose)

My feeling is it's
Apache 2.x
PHP 4.x
Mysql 4.x

I'm currently trying (with Apache 2 and mysql4.1)
PHP 5.0.2

But I get the feeling even though it's 5/6 months old now it's not a good idea yet..

I want to run specifically for now the CMS mamba (and I am having issues)

I assuming of course it's not necessary anymore to have to run apache 1.3 or mysql 3 or php 3 (I'm also assuming based on what I read mysql 5 should not be used for production enviroments)

running apache 1.3 + mysql 4 + php 4 on both fbsd + linux quite comfortably here

Depending on your needs apache 1.3 is probably the safer bet. That being said it sounds like you are just going to be running a few sites. If that is true and apache2 runs fine then stick with it for the performance gains.

php4 and mysql 4 both work great.