Imageprint with Phatte black. I have been using it for 4 years now on my 9800. I have added a 7880 just for Photoblack, but with papers like photorag Baryta bronzing is minimal and in fact most of the printing is still done on the 9800 (bigger rollers are relatively more cheap). Also, why don't you buy a used 7800 instead of the 7880, there is really not much difference in final print quality.
If you have the funds though,the 7900 is the machine to get, and also Imageprint is not cheap.(but you might find a good "package deal" since many people are selling their Imageprint license.
I'm thinking on replacing my aging 7600.
I'm affraid the 7900 is out of my reach. Thinking on a 7880 for a lot less. I solved my PK/MK swith with the so called "south-african way".
Is there something like that for the 7880 model?