Don't know much about the competitiveness, but from what I've heard the pay isn't as large as cards or gi, that's for sure. I've heard anywhere from 150 - 170$ K/yr. But in the end, if that's what you really like and enjoy, then go for it.
Cards (non-invasive) about, median $275K (I've heard as high as $340K, so I'll stick with the more conservative estimate). GI about $220K.
of course, if you go into private practice, and sit around doing endoscopy all day, you can make much much more than $220 as a GI. that sounds like it might get real boring though, i personally would prefer to stay in the academic sector.... another thing -- endocrine might take a hit in terms of paycheck, but its got a sweet lifestyle going for it.... the few endocrinologists i know all seem very happy, and lead relatively normal lives.
