I don’t think after a break of 6 years you should go to a fresh area totally unexplored and experienced by you. Good thing is that you have 8 years of experience on Oracle and SQL Server, so easier way is do mastering on latest versions of Oracle and SQL Server (10g and 2008/2005 respectively – or any one of these), tap your old contacts and get a job as Server Administrator. This you can achieve quickly. Once you are settled, then you can go either for SAP (ABAP) or BI/SAP BW, learn, master and settle down. Otherwise even your current expertise can give you good re-start and future as everything runs on database and Oracle and MS SQL are leading.