Shoot color, and do the conversion in CS using this freeware:
http://www.digidaan.nl/indexframedigidaan....ixer/index.htmlSimilar to The Imaging Factory's "Convert To BW Pro", as it uses the color info to give you the same look of as a BW "red" filter, a BW "green" filter, etc. You can thus get a very customizeable BW conversion depending on your subject matter.
For those not familiar with how BW filters work, they lighten their own color and darken the opposite. A red filter used for a landscape shot will lighten red things, and darken the opposite, like the cyan sky. For portraits, a yellow or orange filter will minimize freckles, or other skin pigment features, conversely, using a blue filter will make every itty-bitty freckle and mole scream right out.
Using a CS action like the above gives you the ultimate in an infinite amount of control on how that B&W tonality will look based on the color oroginal.