I just got this from sun... may be helpful, I have not tried yet.
http://www.sun.com/software/solaris/amp/index.html?cid=250494
If you are not going to use the beast for x-windows any configuration on the ultra 5 should work. I have been running mysql on old sparcs and it runs well and very reliably but comparing it to mysql on a brand new ultra20m2 or even my old blade1000 makes the poor little ultra 5s weep. If you just want to play then the ultra 5 should be fine.