Hello John - sorry to hear about the problems with the IP4000, got one myself I use for general stuff rather than photo prints. Even so, never had it clog once. I keep it turned off when not in use and only use Canon inks - don't know if that helps!
The question about prininting stuff and costs is always difficult to weigh up. I think you should estimate, how many prints you actually intend to produce, if its just a few for round the house, it may be very much cheaper to get them printed via a photo processor.
As far as the HP pro B9180 goes, it seems to use larger ink tanks than many A4/A3 printers on the market, so ink printing costs could be much lower than we are used too from HP printers. For paper prices check out the link below
http://www.7dayshop.com/catalog/default ... ARCH&comp=
As well as the HP media, check out the ICI matte paper and Ilford papers, but check with their sites to ensure print profiles are available for the B9180 before you buy.
You also need to think about calibrating your monitor and factor in that cost as well.