Well, as far aftermarket inks goes... I should not say that this bad or good idea - this is up to you to decide... Keep in mind that best ink for your printer is OEM and you do have a risk of clogging using aftermarket ink. Higher risk with cheap inks and lower with better ones but is there. There is no aftermarket printheads and OEM one will cost you pretty penny, like 700-900 USD plus whatever service engineer will charge you as it is not user replaceable and takes just a few clogged nozzles to kill it regardless if you replaced it yesterday or 4 years ago. So do risk estimate and do what is right for you. It known that you're likely to have less problems if printing constantly, i.e. on daily basis if not that saving a little per print could sky-rocket your service costs. We have an Epson 10000 which is older generation than 9800 and always used oem inks, I capable of changing the printhead myself but the fact that it is $800 part won't change, yes we may be a little more expensive that competitors but we print 720 dpi rather quick-mode 360 and prints look excellent, some customers walk away many of them come back.