As others have said, this does not appear to be a heavy workload. Although if you're running 5000 queries per day on a 15Tb datawarehouse....that's a different story. You really haven't given much information about what you're trying to achieve here.
Nor have you said if this needs to be accessible via the internet - if no external access is required, and this is a basic OLTP app, then paying for hosting may just be overkill - if you already have the infrastructure then adding 5 new vhosts and a DBMS to an existing server or even a virtual image might be cheaper.
Certainly if you go down the route of a hosted solution, although basic packages may appear to offer what you need, IME (www.ralstonrats.co.uk) cheaper hosting can mean very high latency. If you've already got an ISP, go talk to them first about their hosting.