Please note, 50k to 60k is probably low for Oracle, who now charge by the "power unit" of your server. The formula, according to the most recent article I've read is $100 each CPU Each MHz, so a Dual 800MHZ PIII would cost you
1002800 or $160,000 to license yearly.
I can buy a pair of 4 way Xeon machines running Postgresql in a home made failover for that, and still donate $50,000 or so to the postgres folks for further development...