For those that enjoy the anatomy, the procedures, and the subset op patients that DO get well, then spine is very satisfying.
But the operations themselvs can be very long, very tedious. The patients tend to have unrealistic expectations. They think that surgery is the magic bullet that's going to take away all their pain when that's not really the case. At my institution, the residents can be operating pretty late depending on what is scheduled. Combine that with the fact that a lot of these patients can get quite sick post op. So no, ortho spine is probably not the way to go for lifestyle.
And how do you know neurosurg isn't for you, because the hours? Well, if you're not really into ortho besides the 6 months you are on spine out of a 5 year residency, then those days can seem pretty long too.
Finally, not to sound like a dick, but the vague reasons why you stated you were interested in spine coupled with the mention of salary kind of makes me think most of your "interest" came from sites like this:
http://www.allied-physicians.com/salary_surveys/physician-salaries.htm
And I may be wrong about that. But if I am not, I would dispense with the notion of doing spine at once.