Prolexic is costly but deliver results. One of our sites last year received the 6th largest DDoS attack recorded and they did the job quite well (not perfect, and a lot of things were learnt trial-by-fire, but overall for the situation, quality job).
On the DNS-only DDoS protection, go with Neustar. Much more affordable but won't help of course if the attackers can reach you by IP directly. 95% of attacks, though, go through the hostnames.
(both of the above aren't hosts, they are simply 3rd-party services. Thus you can use whatever hosts you like).
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