Alphalpha
Regular
Anything you try beyond the Rubiks is going to feel like butter. You're exactly right, you have to try the cubes to know these things--to compare and understand these descriptions: "crunchy, etc...). Lock-up's do happen sometimes even on the Aolong, less so (for me) on the Zhanchi and Weilong. You will have exponentially less locks on any true speed cube. I'd get the Zhanchi because it is tried and true and it will give you the best experience over all--accurate, fast, forgiving, fun, smooth. It can also be found for relatively cheap--though there are Weilongs for 8$ on a certain giant internet retailer. The Guanlong is a good cube for the money, but spend the extra money and get a great cube to feel it. Anyway, whether you buy the Guanlong$ or the Aolong$$$$ or any in between, you need to learn to lube them and tension them. It makes all the difference in the world. Even the Guanlong needs a tune-up.