My guess is you will be happy with the 1440LB. The bigger capacity and those occasions when you'd like to have the big bore will make some things much easier. Like has been said, you can make small on a bigger machine but not the other way around. Just buy tooling and accessories as you need them. All the things you want to add mount up. It's OK to buy the Chinese accessory stuff. Some is perfectly serviceable some not so much.
A lathe and a mill make a set. I'm guessing you don't have access to a mill - yet. I hate to say it but the same choices come up again when you start looking for a mill. New/used, bench or knee, Chinese/Taiwan/European and a lot more accessories. The rabbit hole is deep!