David,
Honestly, no matter what aqueous printer you get, it will have clogs. An Epson technical rep made a really good point that if it's an aqueous model that uses water based ink, it will clog; just depends on the users environment and how well the printer is being maintained. You can't get away from that unfortunately. However, the newer models will have features to help with clogs (Epson) and HP/Canon's have the same head technology that will be better towards clogs, but the ability to have extra nozzles as back ups. They do have the ability to replace the heads when they either go through the lifetime of ink or go out.
Epson's P series have been better on maintaining clogs and the newest version will have the ability to clean the head carriage and another part that you weren't able to touch before. So, it's really based on what features you want in the printer to go between Epson or Canon. Canon will have tons of nice tools/features that are free from Canon's site; similar to Epson's with their newest series.
The replacing of the Epson head will always be the part that's expensive (if it needs replaced), but Canon has it available to replace directly (even if the unit is out of warranty). However, Canon's heads are also under a 1-year warranty upfront, so if they do go out in that time frame, Canon will replace it at no charge.
There are goods and bads within the brands, so it's really based on what you're really wanting from the printer or looking into.
IT Supplies