Digital BW, The Print

I have an unused R260 and an R1800 printer. I have been using QTR and 
the R1800 for BO printing with one black ink and no toning and have 
gotten pretty good results. However, In the hope of even better 
results, I was planning to set the R260 up with a set of UT-RCW ink 
cartridges from InSupply. I ordered the ink cartridges, but they have 
been back ordered for almost a month now. Having had so much time to 
think about it, I am wondering if I should use the R1800 MK-3 process 
instead. I understand it will make the R1800 into a matte printer, but 
I think I can live with that. Or maybe I should stick with QTR and one 
black ink (I actually don't notice any banding or other significant 
imperfections, just quite a lot of warmth). So, which is the better set 
up, the R260 with UT-RCW black only inks, the R1800 with 3-MK or the 
R1800 as it is with QTR and one black ink?

Thanks for your opinions and I apologize for the rookie issues.