I spent years as a guide/outfitter down there so may have a few insights you'll consider worthwhile. It's a wonderful place as you know if you've done it once already.
Kayak: A comfortable, fast playboat/river-runner would be my choice. Something a little (but not too) old school. Perhaps a Necky Mission or a Pyranha I:3. Many of the surf waves aren't terribly steep or breaking, although they can be huge, and most spud boats have a hard time catching them. This style of boat is also much better in the flat sections, of which there are many. Of course a creeker or large river-runner would be even more comfy but not much fun when you wanted to catch the odd wave or play in the eddyline at camp.
Features: This all depends on the water level. It drives me a little nuts hearing people talk about what the rapids are like who have only run it once. Please believe me when I say that Horn Creek is two entirely different animals at high and low levels. High water is big fun but low water is very scary in a raft. I've run the river when the dam was shut off, imagine 800 cfs of leakage through the bedrock, to when it peaked at around 90k in 1983, and pretty much every level in between. You will find all kinds of different features down there depending on the levels. If you're going in August you will likely have higher water as that is when all the air conditioners are working overtime in Phoenix. Higher water means less defined features. Who knows what the levels will be like next year however, as Powell Reservoir is very low and the southwest is still in a drought. Either way I still recommend a comfy, fast and playful boat.
Riot Sniper: This boat would not be one of my choices. Although it is very comfortable and has plenty of float to help with that lunch and six pack you'll be carrying along, I don't imagine it is a very good big water boat, nor will it play much. The short displacement hull doesn't surf particularly well from what I understand, and I am guessing you'll get knocked all over the place when trying to nail a line in the big stuff. I have never actually paddled a Sniper however so I may be speaking out of turn.
Best Grand Canyon Tip: Don't waste time lollygagging around camp in the mornings! Get up early, get downriver and find the next hiking spot. There are so many amazing places to see down there and you'll never see them all in a lifetime of trips. After literally years in the big ditch there are still many, many places I have yet to see.
Permits: Actually, with the new system it's not all that hard to get a permit, especially if you can do it on the shoulder seasons before and after the summer rush. It seems that everyone I know who has applied has gotten theirs within a year (since the application changes of two years ago that is).
Other handy tips:
Bring lots of sunscreen and lotion as your skin will get burned and very dry.
Bring bag balm to help heal the painful cracks you will get in your hands.
Bring superglue to fix those same cracks.
Bring a helmet with a long visor. A Sweet Strutter would be perfect.
Bring an extra pair each of sunglasses and flip flops.
Cotton clothing is better than synthetics when it's hot.
Somebody bring a musical instrument. A guitar is perfect if anyone can play.
Have a great time! It is truly a wonderous place and we're priveledged that we get to see it from a boat.
Kyle
------------- "I used to be somebody, now I'm somebody else." Bad Blake
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