Its the best fishing trip you can book. I'll probably go back this year. I was planning to go to Tanzania but that looks like it is going to fall through.
I haven't been in two years and I miss it, you have no idea what a special place it is until you get there. What ever you what to know about the trip I can fill you in.
I wouldn't go there thinking about targeting catfish first. The guides are tuned into catching peacocks. Once you get a peacock on topwater you'll know why, they are like a pissed off smallmouth. Usually by the 3rd or 4th day you are beat up and its relaxing to go catfishing for the last couple hours of the day. I have never caught one in all times I've tried.
The boat from your link on the Rio Negro River is the Blackwater Explorer. Its a good operation. I met the women that runs the boat, she's cool. Ties a good jig, but there are nicer boats on the river. I would recommend using the Santana or the Captain Peacock if you wanted to go the yacht approach. River Plate has a fly in barge operation that gets you to some remote places. But they do tend to cancel a lot. They cancel if the river the barges are on loses too much water, it takes a week to move the barge to another river. They will tell you a few days in advance so there is a lot risk.
I was like you about a couple of years ago, wanting to go but didn't know where to look. I can put you in the right direction and recommend some good people to work with.
Here's a youtube video made from the Santana. Just dont book a trip through hooked on adventures, worst operator out there. You'll get screwed. The Santana has some of the best guides, the guy with the chainsaw is Enrico, he is the guy I usually ask for.
http://www.youtube.com/watch?v=XQOOl1t3w30
BTW, if you click on my profile that is my largest peacock.