You can get unlimited cPanel accounts, ftp/email account, subdomains, parked domains, etc. but everything must fit the disk space, which is never unlimited. Providers offering Unlimited space , just putting your account in "Overselling Enabled" = True, so the "unlimited" is just a nice word.
CentrioHost is scam. So don't go with them. If you search on google then you will see huge scamming report about them. Just write "centriohost scam" on google and you will see result.
The best reselling is available from cyberls.com. Unlimited domain and unlimited space package at 50% off by using Promo Code: 50offreho is provided by them.