All the critical things should sit in RAM anyway. The SSD will beat the HDD if you read/write to disk heavily. But not if you need space.
If I need an SSD, there are options too, though DigitalOcean is indeed one of the best if you need a cheap US-based server. If the location doesn't matter, EU, Russia, Ukraine have some great deals.
Example: $4.6/month = 40GB SSD, 1GB RAM, 3 cores, unlimited traffic @200Mbps.
https://firstbyte.ru/vps-vds/kvm-ssd/