Doug,
I have an ancient Beseler 57MB that uses a custom built in Aristo cold light head. I had them install a new lamp and new heater shortly after I bough the enlarger. It was worth it.
I do have to use the 40ccy filters to smooth out the contrast and the times are a little longer, makes dodging and burning easier.
I paid $250.00 for the enlarger about 10 years ago. It is still functioning nicely to this day.
gene