I am not an expert but I had many printers and I will try to give you some suggestions.
Now I have an Epson R2400, an Epson 4880 and now also an Epson 7900 in one room. I had clogs with all my printers (except for the 7900, but it is a "new entry"), but now I have less to no problems. I never had clogging issues while printing. I could do a cleaning before the prints session (I always start with a nozzle check) but I never ruined a print because of clogging issues if the print was “clean and checked” before the beginning of the print session.
What I do to improve "anti-clogging" is this:
1) Use dust-covers (not necessarily the antistatic ones, also if they do a great job).
2) Check and control the humidity in the room. I had this possibility in the last moths and I can say that, since I started to have 50% humidity in the room, I got no more clogs in the R2400 and in the 4880, also after 2 weeks of not using the 4880 at all.
3) Try to print at least 2/3 prints each week and possibly, when you print, try to print as much as you can. I found that could be better to print twice a week 10 prints for session that 2 prints each day.
I would say that, if you are using OEM inks and good paper, in the 7900 there will be no clogging issues related to them. In the 4880 the paper cutter is slower and makes some "dust", but in the 7900 I could notice no small dots of dust or pieces of paper when I cut the sheets. I really don't know why the printer clogs but, in my experience, I think that the problem is 20% dust and 50% humidity and 30% not-working time between print sessions.
A close friend with an ipf5100 was happy about his printer clogging performance but he had to change print heads after 2 years of usage (he really used the printer for a few prints, 3 set of carts in more than 2 years). Here in Roma, Italy, I go sometimes around for print laboratories and what I could understand (probabily it is wrong, but is my experience) is that Canon are great printers, but if you think that they don't clog "for free" I could be not true. When the Epsons clog the Canons will start to partially kill the print head (usually for low humidity environments) and so what you waste in terms of Epson ink ($$$) is generally wasted for Canon print heads ($$$). Nobody seems to use other brands, so I have nothing to say about HPs or other printers.
You already have an Epson 7900, I think one of the best printers now, try to keep humidity high (if possibile) and to keep dust away from the printer.