I was interested in this field from the moment I even thought about radiology. In fact, it is part of the reason I gave up neurosurgery (yeah yeah, some of you will say I'm stupid, etc, but I'd rather read films exclusively when I'm older as opposed to doing spine surgeries over and over again).
I spent my 3rd yr spring break with a neuroIR guy in my hometown. It was a great experience. I also started a research project then and was able to attend the AANS/ASITN joint meeting a month ago in New Orleans to present a poster. The field is excellent, it just requires some persistence and drive b/c the neurosurgeons are hungry, and they see what's going on. BUT... they have too much other work to jump into NIR. There are neurosurgeons taking over in some areas, but it's still a radiology thing for the most part. What needs to happen is radiologists need to compromise their "consultant" tag and become clinicians, for the most part. They need to get referrals from primary care docs/neurologists, set up clinic time, talk with patients, and do the procedure and follow-up. The NIR I worked with had it setup exactly like that, and as a result, is extremely successful and without much competition at all from neurosurgeons.
That was long-winded, sorry. Feel free to discuss more.