Digital BW, The Print

I'm currently using monochrome Lumijet (Luminos) preservation 
series inks, but they are quite expensive and was wondering if 
anyone had any comments suggestions about the cheaper MIS 
or Lysonic monochrome inks? How do they differ in print quality, 
archival qualities, and the seeming ever so present head 
clogging? Lysonic is about half the price, and would switch if I 
wouldn't be giving up quality. Has anyone any experience with 
these other inks, and which is the best and for what reasons. 
also any info on the warm tone inks would be appreciated.
Thanks all for your help!