Hi Jereboam ,
imho, just download a trial copy of sql 2005 desktop from microsoft site and try it.. its exactly the same as enterprise edition except the db engine.. you will find it quite practical and have many tools.. I guess you wont look back to expensive oracle.. 
Thanks for the advice. Shortly after I lost my job, I downloaded the Enterprise edition and went through it in detail. I was quite impressed, and learned a bit about what it can do. But working at home on my own isn't going to make me an expert. If I get the opportunity to use it as a Systems Analyst or Designer, I'll know what to do, but I'm never going to achieve DBA skills - don't have that sort of mind.
I was very pleased when the six months trial ran out - I got my PC back again - SQL Server absolutely knackered it.

Trust me not too much effort required to be an MS SQL DBA.. You already know PL/SQL.. Routine things like back up,recovery, tuning with system parameters is mostly adequate..
I as a programmer learned everything myself from its documentary although took some time and mostly under disaster conditions

, briefly you learn very quickly in case of emergency..
Microsoft from time to time makes DBA exams from its books and documentary , you can get a certified DBA level easliy imho.. (but you need to pay money for those exams unfortunately)
ps: Enterprise edition mostly is for multiple CPU servers..Although initial configuration dont utilize too much system source.. You can get this by playing with parameters and configuration..