Here's another 2cents while we're at it: I've flown every plane mentioned except the Goldberg Eagle. My personal choice is the Avistar. I teach a lot of people to fly RC and the Hobbyzone Super Cub and the Avistar are my two workhorses for training new pilots.
But here's what I tell most people: If you're concerned about nothing other than a nitro trainer that is going to get you in the air quickly and easily, go with a PT-40, or LT-40, or any of the other flat bottom winged trainers. Even the Nexstar will get the job done if you leave all the crazy gadgets off of it. If you love flying like I do, even these planes will never get boring.
But, if you want a trainer that flies easy, but is going to grow with you and do the best job of getting you ready for your next plane, then you need a semi-symetrical high wing like the Avistar or Alpha. I personally prefer the Avistar as I find it to be more aerobatic and better in the wind.