All attacks are different, but the current filters should mitigate most of it, if anything happens. DDoS is tricky and there is no bulletproof solution against them. Being an offshore host, it is quite common to get attacked in a similar fashion, but then again - we allow most things others don't.
Why you don't try to create a cloud hosting solution ? If a hackers kill one of your server, others will handle the job while you recover the first one ?