Digital BW, The Print

I am not new to the Epson 2200 or 2400, but mostly for color work. I 
would like to produce more B&W images and was wondering whether the 
consensus is to send the image from PS to the printer in monochrome or 
send in color and use the Advanced B&W function. Seems, intuitively, 
that it would be better to get the tonality right in PS and then send 
it to the printer driver and print as a "color" image (assuming 
WYSIWYG). If you are converting color to B&W, what are the least 
destructive methods: Calculations? Greyscale? Desaturation? plug in 
B&W filter? (I have the Nik one).The Advanced B&W function in the 2400 
looks good but does not give you a print preview that shows the tonal 
tweaks (like Sepia) that you make. I once had some settings I got off 
the web that someone used in AWB to get consistent sepia prints. Lost 
them. Thoughts? Thanks.