You should also be able to find lots of youtube videos on all those rivers.
When you say "Natla", do you mean "Natla / Keele"? - just the Natla would be a long and expensive journey for a short trip.
What "whitewater" are you looking for? - I think there is quite a variance in the difficulty of the rivers you have named.
How long a trip (in days) are you hoping for?
I share PaddlingPitt's preference for a small group. I don't even take the second person. But if you are interested in running rapids near the limit of your canoe or your skill set, multiple boats of capable paddlers would probably be a better idea. Are you willing to do (if feasible) some portaging / lining of rapids to accommodate a single boat trip?
I don't think you need an outfitted trip - but you may decide you need some "outfitting" for your trip. Would you bring your own boat, or rent? Would you drive to your "take-off" point, or fly? There are a lot of things - bear spray, stoves, fuel, even matches, etc. - that you can't legally fly commercially with and would need to obtain locally before setting out.
Finally, prepare yourself for some "sticker shock" in the northern charter aircraft market.
I don't mean this to sound negative - with your experience you should be able to do the trip, and have a great experience, regardless of the river you choose. But don't underestimate the logistics - I think the problem of getting them all organized is what leads many paddlers to turn to organized trips.
Best of luck,
wjmc