Can someone please help?

The company I work for have been supplied by Tiny (oops) and now we have to find another supplier.
The options have been narrowed down to Mesh, Dell or Evesham. From a techie point of view we need Pc's that are not restricted BIOS wise and can get parts for from any where so that they are not company specific. I understand that some companies only have company specific power supplies, motherboards etc etc

We also need a reliable pc that can handle being left up and running 24/7 without blowing up!!


We need to make a decision within the next week or so (typical last minute!!!) so any help fast would be appreciated!!!

Thanks to you all!!!