I suppose all of the chinese made import lathes leak oil, but I've read about guys on a couple of machinist forums who've gone through theirs and at least slowed the leaks, if not eliminated them altogether. I bought a PM1440HD from Precision Matthews more than 10yrs ago, mainly because it was very similar to the Jet 1340 I'd bought as my first lathe. I've been through the seals on the controls on the PM lathe, and can't really tell if I even slowed the leakage...not much need to change the oil in the headstock, because I have to top it off with fresh oil fairly regularly. However, the spindle length of both my machines is a limiting factor - they're both over 24" long, which makes it necessary to work around that issue when trying to do through the spindle work on shorter bbls. If I'd known then what I know now, I've have forgone some of the weight of these two lathes in exchange for a shorter spindle - or at least looked for a machine with both the weight & shorter spindle. Not many chances to examine lathes or other machine tools in person out here in western Kansas, but it'd have been worth it to travel to get a close-up look at several machines before investing in one. I can do good work with the PM; reamers that have been prone to chatter on the JET usually cut smoothly on the PM, yet both are heavy in today's market, weighing in at a ton or more.
Whatever, sounds like the Nardini you're looking at might be a good choice - I remember reading good things about them when I was looking for my 1st lathe in 2004. From what I read, I'd have liked to have been able to find one out here, but there's darned few machine shops in my area, and the ones I've visited usually had bigger machines for stuff like oil field work.