Hi Joe,
I have a 1953 Model "A" imperial Boxford it's been a great machine over the years, if I wanted to replace it I might go for another Boxford but a later 5" MKIII AUD.
With belt drive machines like mine when running they can be almost silent something to consider if your workshop is perhaps inside a house or flat.
Parts are readily available and lots of South Bend bits like the steady rests, changegears can fit as well as the Boxford was designed from the SB 9" machine.
There are a lot of poor quality machines out there for silly money, if you are not entirely sure what to look out for you could do a lot worse than contact one of the dealers who regularly advertise in MEW to supply a machine.
Regards
Paul