It's easy to find a light source for either an Omega D2/DII or similar Beseler. Many light source heads have adapter rings to allow them to mount on either enlarger. There are a lot of used ones out there. Arista cold-light heads, the variable-condenser D2, fixed condenser, omega color heads, mornick color heads, ilford multigrade head, the minolta color head which you'd probably want to avoid, etc.
That's the advantage of an Omega or Beseler. Availability of bits and pieces.