If you're averaging a minute, stick with your Storebought, seriously. I have a video on this, "my lecture to beginners". Using the storebought will allow you to build skill and accuracy, so that when you get faster, you'll be better with a good cube than if you switched now. Don't even think about Zhan Chis and lubix, hahahaha. That would be a big mistake for you. Advanced cubes for advanced cubers, beginning cubes for beginners. If you really want to switch to a first DIY, I'd say get a C1. Just always remember, your speed isn't because of your cube. It's you. Harris Chan, Yu Nakajima, etc... all these people averaged under 10 sec, when all that was available was a type A, C, or Rubik's brand.