Hello pals....

I plan to buy a new unix or linux distro so i want help from you.Kindly reply to this.
Which should i buy a linux distro or a unix?In unix what about FreeBSD or should i go for OpenBSD or any other?Is FBSD compatible with intel processors( i use P3 855mhz,128mb ram 20gb hdd).Do compilers come buitl in with fbsd as in RH linux(i am using it now).Is java SDK compatible with fbsd ?Is their any difference in commands in linux and BSD.Will it run on a linux partition?can freebsd used for a workstation( i don't have plans to use it on any server)

If i go for linux which distro should i use ?What about slackware ?Any other stable distros in linux ?

Thanx in advance.