Looking for A New Cube
I would recommend the Zhanchi, that's my personal favorite. Also, I think the PanShi is worse than the Zanchi, Guhong, Lingyun and Lunhui. I know not every feels that way, but I know I'm not the only one who really dislikes that cube.
The Lingyun is very fast and a little clicky. I like it but I find it a little hard to control. The Guhong is very smooth, while the Zhanchi has a crisp feel to it. I prefer the Zhanchi, then the Lingyun and after that the Guhong. All are fantastic cubes. For someone new to Dayan cubes, I'd recommend the Zhanchi or Guhong.
Lubix has good cubes, but you also have the option of just lubing and doing the 48 point edge mod yourself. The major benefit of buying from Lubix is that you'll know you're getting a cube that is well lubed and ready to go (mine needed its tensions tightened a bit).
I also have a Fangcun which I like a lot, although I prefer the Zhanchi over all. I would recommend switching out the Fangcun springs for Dayan springs if you decide to go that route. The stock Fangcun springs are hard and result in a tight cube when tensioned so that it won't pop. The center caps also pop off quite easily, so adding a small piece of paper to wedge the cap in is necessary.