Based on what you've said here, if you only want to purchase a single product that provides all these features a VPS would probably be your best option. You maybe able to get by with a shared cPanel Hosting account with the highest resources, but that would be hard to say for sure. Keep in mind that such an account would also have a 250,000 file limit. That would include all website files and emails. A VPS would probably give you better performance but would require someone to act as a server admin.
If you can provide more information about how your sites are made and how much traffic they receive, that may allow others to give you additional suggestions.
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