Depends how long it will take you to get the final 250, and whether when you reach the 1500 makr, you'll have met all the other requirements for PIC, X-Country, Instrument and especially Night.
I would personally hang out and get the ATP done. After all, it never expires and it will be to your advantage to have it if a time should come when you would want to work for a US operator. While you're in the "U.S." mode of aviation-thinking it will be easier to do it now than later.
As for it looking attractive to a JAA operator...I highly doubt it. They're more interested in a JAA ATPL. If you have that, they won't care two hoots about any FAA qualifications.
But in the end it's up to you and your priorities.
Ray