WHMCS License is also available with the SSD VPS plane. You need to install WHMCS key after run your VPS. Get a WHMCS License in $15/m.
Add dedicated IP into your domain name and also for other domains. You can buy a Dedicated IP in $4/m.
You can get different types of SAN storage into your VPS. If you need addiction storage for your server than you can also buy the storage. For 50 GB SAN disk you need to pay 20$/m, 100 SAN disk: 40$/m.