I registered a new domain for myself. Actually it’s the previous one that I used.
It’s librehat.com that I used for my Chinese blog and its subdomain en.librehat.com is used for my English blog.
There’s nothing you should worry about, the blogspot will redirect it automatically. :–)
If you’re interested in domains, you may want to look around at Crazydomains.co.uk because their domains are dirt-cheap (start from 1 GBP).