Don't worry about CentOS 6.8. It will automatically get upgraded as part of the install.From your PM mentioning Vultr I did a comparison spreadsheet and found Vultr is better deal for the money. However they have CentOs 7 or the CentOS6.8 ISO, No 6.9
And I just destroyed the droplet too. On DO for $20/mo was 40GB 2GB Ram where as for that same $20 is 60 GB 4GB Ram so better deal
I am just not having any luck.