Hi,
You're obviously going to think I'm biased as I currently have a Super Nice SG up for sale on pinside marketplace as of this morning but I've played all of them. While they are all fun there really isn't much "meat and potatoes" with T2 or Whirlwind. I find SG to to definitely be the best out of the 3 you're considering. Many people have considered SG to be the best System 3 ever made and it's truly built like a tank. I don't think I've ever seen a better Translite. All the best to you with whatever you decide to purchase.