Web- and DB-Server: High clock rate and less cores vs. less clock rate and many cores

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http://serverfault.com – I am currently looking into setting up a new infrastructure for a hosting project of mine. Basically it will be managed hosting with a strong focus on Django-based apps. All will be Linux-based of course with PostgreSQL as DB and either nginx or Apache as web server along with GUnicorn etc. Now I am scouting the market for server systems to rent and it is tough to get things that fit the budget and all criteria. So I would like to ask for advice on the following. All the good offers I could find either use single high end XEON E3-12xx (Quads @ >= 3.2Ghz) or many core Opterons (either 6000 or (HowTos)