I am using DreamHost and I am very happy with their service. They offer a lot of features for the price.
Their basic $ 8 plan includes:
host unlimited domains
host unlimited subdomains
20 GB disk, 1 TB transfer / month
3000 mailboxes, 75 Shell / FTP users
php with unlimited mysql databases
In addition, the disk space capacity increases automatically by 0.2 GB / week.
and your allocated bandwidth increases by 8 GB / week
These 2 features + unlimited domains are my favorite features
Do not hesitate to contact me if you have questions or anything