you can get solaris 10
here Its a sweet enterprise OS and integrates very well into most environments. We run Solaris for our enterprise backup server and it works great (but we are running it on a 30K dollar computer). The intel versions were always a pain, and unless things change (and they could) you wont see too much Solaris running on intel in a server room.
If you really want to try solaris and have a few bucks I would highly recommend going to Ebay and picking up some sun hardware (you can get something which will run Solaris 10 for less than 200$)..