I bought a new K-1 and 28-105 just about a month ago. I wrestled with the same issue you are wrestling with now. I seriously considered getting a Canon 5D3 and 24-105 lens. I already have a Canon 430 EX ll flashgun for my Canon G12.
It is a tough question and a question I've put lots of thought into since 2007, when I bought my new then, K10D. After 10 years of research, wondering, thinking, doing the old pro and con deal, I still haven't been able to work out in my mind what the best decision would of been and continues to be.
Where I am now, is thinking that all camera companies that make sophisticated equipment for advanced amateurs and pros are not enjoying a golden era. According to what I've read, listened to...cellphone cameras are improving at great speed and who knows how good they will be in 5-10 years. Maybe as good as a full frame DSLR ...I just don't know, but I do know technology has made huge strides in cell phone camera photographic quality . First it was point and shooters...then advanced compacts...such as my G12. Question that runs through my fevered brain is that will DSLR's be very far down this road.
Will Ricoh one day say enough, that's it, production will stop. Maybe. Happened to Minolta, Petri, Miranda, etc...all sorts of camera brands that have up and died and now litter the landscape.
I have heard that Nikon is not doing so hot. I wonder about Fuji, Panasonic...even Sony. If there's not enough bucks being made, a company will fold.
I think the only camera company that will be here...for sure....in 25 years is Canon and I'm not 100 % on even that one, either.
Ricoh seems to have adopted a marketing strategy of using online marketing to peddle their Pentax. I know I go into my local camera store and don't see Pentax anymore on the shelves. I do see Canon and Nikon and a few others...but I also don't see very many customers at these stores either. I have stopped using one of my old camera company health scores based on how much product is in the stores. Stores seem to be closing right and left, the last few years. Online seems to be the thing. Younger people like my kids and their friends (they're in their 20's/30's), don't go to stores all that much...they order online.
So maybe Ricoh aren't idiots after all. I do read some newspaper reports that indicate when some camera stores go into bankruptcy, their main creditors seem to be companies like Canon and Nikon, etc. that are owed significant amounts. This can't be good for Canon et al..I would think. But then I'm not a financial whiz and don't understand big business...so maybe I'm wrong.
Maybe Pentax is right in their marketing. I don't know.
All I do know is that my new K-1 and my older K-5, Km and K10D are all working nicely (touch wood)
and I've been ...as the Brits would say...well pleased... with their performance.
If Ricoh does pull the plug and my old Pentax equipment eventually shuffles off their mortal coil...before I do...well then perhaps I will buy a minimum of equivalent Canon equipment to tide me over, in my years remaining.
In my roundabout way I'm saying I intend to keep my Pentax stuff and stick with this fine old camera company..it really works well and helps me produce in my humble opinion, really good photography.
As to those who seem to rush to bid you good bye from the Pentaxian fold...I would ignore them...along with those who forever assert that Pentax is doomed....kidding or not...it's a tired old phrase.
But in the end, only you can make a decision for yourself. I only hope that my thoughts assist you in your decision. Again I know how you feel and the agony of the decision making process, as I have shared it and it still continues to be an issue for me.
Les