Decide on how much you might actually use this type of sander, that will help with your budget setting. I wanted a decent machine, but Benchtop because I have precious little spare floor space in my shop like everyone else.
I bought the smaller Jet model, JBOS-5 and really like it for spindle work. It's not hard to track down the larger, optional spindle either if you want it[ I think it's the 3" diameter one]
Not sure what Dust Collection mods the UK poster did to theirs, I'd like to see, but no pictures in his post. I have an adapter sizing up to a standard 4" DC hose, works well enough for me with my single stage Delta DC unit that I've never tried downsizing to a Vacuum hose for higher velocity air movement that one of my Festool vacs could provide in dust collection from the sander. [scratch chin]