usually though, cmyk black and white images are pretty well reserved for what could be called "high end" bespoke printed photography work or posh corporate brochures that can benefit from a bit of TLC (tender loving care) in the process. cmyk black and white images can indeed look much nicer than simply black ink greyscale, but for a decent conversion to be made I would suggest discussing with your print provider who can hopefully provide you with a profile conversion technique to get a decent cmyk black image onto a given paper type (either uncoated or coated paper). Having a very well calibrated monitor helps, but no real substitute for seeing a hard copy contract proof from a print provider. generally it is safer to stick with greyscale, as when converting greyscale to cmyk black and white you have to be careful with possible underlying color casts not seen on a monitor until printed. the answer to this really depends on a number of factors, getting decent greyscale images to print in black ink alone can depend on the paper and also the actual quality of the source greyscale images you have (decent highlights and shadow areas), the same would be true for cmyk black and white.
that is a very good question about whether or not to leave greyscale images as greyscale or convert them to cmyk black and white when printing your artwork in cmyk. = RE: transparency washes out other elements matilda13 (TechnicalUser) as you have discovered greyscale images may appear lighter on screen when a transparent effect is in use, but the actual black ink percentages do not change, it is purely a screen rendering anomaly of indesign. However for commercial printing keep it on the CMYK blend space. The only exception to this is the blend space if printing to a desktop printer, in which case you can get better prints using the RGB blend space instead. if you have these settings applied then you are best to leave them as they are, the preferences option to display all blacks accurately is a useful one. the other area is in the preferences (appearance of black > display all blacks accurately). by default indesign uses the CMYK blend space (edit > transparency blend space > document cmyk) and it is this that effects the display of transparency with greyscale images on the same page. the effect appears on screen to shift greyscale images on a page that also uses transparent effects (such as imported PSD or indesign's own effects like drop shadows). the issue you have come across is a display rendering issue of indesign and how it deals with transparency. i wouldn't worry about taking the thread down, someone else searching may benefit from your post, even if you have solved it yourself.
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