JPEG is all 8-bit (before anyone jumps on this there are 16 bit variants but they are hardly common)
RAW, TIFF are 16-bit (actually RAW is 12 or 14 bit - depending on camera - but PS will handle it as 16 bit)
PSD is 8 to 16 bit
HDR can go to 32 bit and so can TIFF
For what you are doing if it's all for JPEGS then the 8 bit is fine.  If you are going to save to 16 bit PSD from a RAW (NEF) file then you'll need the 16 bit version.
The plug-ins for Light Room are really making me rethink keeping with Aperture.  But the work flow in Aperture is so nice... Why isn't there just one product the does everything 
				
			 
			
		 
			
				
			
				
			
			
				MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
			
			
		 
	
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