That corner wedge I think is a handy thing to have, I bought 2. You can easily make one I suppose but I just bought some and was done with it.
Whatever you decide, try and get all the misc. bits at one time, shipping (because it's international) is a killer for just a couple forgotten small pieces.
While it's in transit, may as well have the other items ready since when you get it you will be excited to set it up lol
In addition to the "kit" you will need a water reservoir, most use a 5 gallon bucket I suppose but I needed something smaller, I got a 2-1/2 gallon from Home Depot. You will also need a 9/16-inch drill bit to drill the proper size hole in the bucket. I used a spade bit.
Mistking and /or Aquazamp are the way to go imo, no others compare in quality, and reliability. Personally I have not used an aquazamp system, but many here have and never have I heard a bad thing. Kevin from aquazamp is a member here(summoner12) and is extremely helpful with any questions.
I have two Mistking systems, and the only problems I have ever had were human error Both work excellent!
I will definetely be purchasing an aquazamp system in the future though!