That's good to know that Kyocera have learnt from their mistakes and I respect engineers like yourself coming forward and explaining what advances Kyocera have made to improve their product line up. Kyocera products are more cost effective, and if they've completely redesigned their new products, they would be worth considering for other future projects that land on my desk.
I can sympathise with your experiences of the old KM-C830s. Those machines, and in fact all of Kyocera's older colour equipment, were absolute dogs. However, with the newer machines Kyocera have basically scrapped everything about the older designs and rebuilt pretty much from scratch. Both the current range of printers and the new Voyager range of colour copiers are fantastic machines which are a world away from the likes of the C830. As a testiment to this, the company I contract to has roughly 100 Kyoceras of varying models in the field, as well as five in their own office, and I am called out to roughly one problem every three months over the whole fleet.
Obviously me putting this on the forum isn't necessarily going to win you back to Kyocera after your previous experiences - once bitten, twice shy as they say - however I would urge you to at least take a look again. Try & get in touch with some companies, etc locally who use Kyocera if you get a chance and just see how they feel about them now. Hopefully you'll be pleasantly surprised.