Lpc2000

>   The only LPC part that does other data sizes other then 8 bits is
> the LPC2138 which has a SPI and SSP unit that has data sizes from 4 
to
> 16 bits. That was the main reason why I moved over to this part.

That's still lame.  It should be setup to handle any 8-32 bit word 
sizes.  There are lots of ADCs/DACs that do 24 and 32 bits.

But I do not understand why you would change parts for that reason.  
Just turn the SPI off and write your own routines.  It is far easier 
than using that SPI module.  Took me 30 minutes and about 60 lines of 
code.  Really simple.  If you want me to post it let me know.

Chris.