I'm not sure how much Latin bass playing, at least as commonly understood, really carries over to Brazilian. If these guys are really picky, as you say, I'd suggest going with something that focuses
specifically on Brazilian styles, if possible.
I just got this a few days ago:
http://www.shermusic.com/brazrhythm.htm
I haven't had a chance to really check it out yet, but if it's up to Sher's usual standards, then it should be pretty good.