From experience managing several customers, arcade sites tend to use up a LOT of bandwidth, and probably one of the more resource consuming sites after proxy-based ones, as well. I'd suggest a VPS or dedicated server for the more popular arcade sites, as you may find good memory and bandwidth key factors. Just make sure you do research first, a good place to check out is the webhosting offers section here on NP, as well as review sites, webhosting disucssion forums, etc.