The Ilford 500 is a great unit...however, you also need the 500S power supply.
The Omega power supply needs the Omega Head. You might be better off waiting for a complete unit with lenses etc. I paid less than $300.00 for a D2 w/ Ilford 500 complete last summer. I've since seen several D2 and D5's for 2-$400 complete , even with cold light heads as well. Be patient... They should be relatively plentiful in your area....check Craigslist Good Luck!