I think the more providers you will be able to check so better choice you will made. Also you need to understand that DDoS protection could be provided on different levels and for different budget. According to your request DDoS protection is a key feature for you and I would recommend you use...
I think that the price and the provider will depend on the server location you are looking for. If that is USA then I can recommend you to have a look at hostingsource.com. If that is Europe, so in this case that would be better to have a look at qhoster.com
There are a lot of web hosting companies in the USA which can offer and provide you with this kind of the services.
But you need to describe what type of account you need? Reseller? Master reseller?
In any case I can recommend you to have a look and check hostingsource.com, hostgator.com...
Yes with hostingsource.com you will be able to get vps starting from $8 per month or dedicated server from $29 per month.
But they located in US. So in case you need somewhere in EU you can always have a look at qhoster.com.