A couple of questions to choose a hosting.

It depends on the tasks performed by the site and the heap of hosting parameters (important is I / O performance, for example), parts of which you will never be told (for example, in the case of OpenVZ, how much VPS oversells).

An “average” site is a completely useless concept, in this case. You can say that the site will withstand roughly 20 requests per second. Roughly - because plus or minus 19.95. Because on the “average” site there can be both a licked architecture (and the site will fly), and the Indian code of the highest standard (and even a single person will have brakes).

The only option that will give exact figures is to set and try, ab(1) to help. Some hosters, for example, give a “test run” for a few days with the ability to return money without question if the service is not liked.

You can not buy and try - find an ancient “celeron” on a 633MHz from a friend on the mezzanine and run exactly what you want to run on the VPS. Feel how will the performance, interpolate to the promised gigahertz. Look at the memory consumption - how much it will eat there, how much, approximately, it will be on the VPS as well (with the important condition - the same architecture, between x86 and x86_64 the consumption will differ).

Do not be offended that you do not get the desired answer-figure, but it really can not be given. If only to invent from the ceiling and lie.