Actually I'm very happy with my 30 year old B series Omega. I'm sure if I could find a D series for the right money I'd be extremely happy. I am worried about getting all the right parts for the two larger formats. I looked at the local Omega repair shop's webpage. It seems that for 150mm I'd need a different lens mount. At least for 105mm it seems the stock mount would work. The prices they've got on rebuilt D series enlargers are enough to scare anybody off-(.
I intend to keep using my current enlarger for 6x6 and smaller. I've got all the parts for it and it works well. So really I'm looking for something for relatively low usage.