(Sorry if I'm doing this wrong. I'm a n00b here.)
anyway, I've been cubing for a little while and I really like it, so I'm thinking of getting a proper speedcube.

Right now I'm using a rubik's storebought that I've sanded and I also modified the centre pieces a little to reduce lock-ups. Though it didn't really help.
I'm currently thinking about just getting either the Guhong or the Zhanchi, but am open to other suggestions. I'd like a slightly 'clickier' cube that can cut corners decently and won't lock up every other turn like my storebought. I'd also like it to be reasonably sturdy and resistant to pops.
I'm also thinking of getting a 2x2, so any suggestions for that as well would be great.
I'd really appreciate it if anyone could suggest where to buy such cubes as well. I'm looking for places with free shipping if possible

I'm based in Hong Kong, if that helps.
Thanks!