There are a few fairly simple or reasonably simple firewalls you can install specifically apf it's the industry standard. In fact virtuozzo generally has ip table firewall installed but not setup. A simple click will activated it, but many don't recomend going this route. Apf firewall is top notch, in my experience never fails, and can be used in conjunction with something like dosdeflate which you can configure by cron to block your specified amount of connections. When the 2 are used together they are very powerful and work excellent.
Vps is pretty much a dedicated in a smaller environment so you have almost full control. Only drawbacks is you should really learn and read up on some of the things about security and modify files/conf to your needs of your site.
Your host such as hostv will help but in the long run you have final say in this environment. They will help, but always take your time and ask questions if your not sure.
Good luck!! | 
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