The way I see it, you've got a Calumet operation in Manchester. Granted, Calumet carries a huge line of products, but having at least a very local branch of the company responsible for manufacturing your strobes would be a huge plus for several reasons. One is very very quick access to any accessory, upgrade, or rental you could dream of or need at a moment's notice, not to mention local hardware support. Further, since they're a UK-based manufacturer, you're far more likely to find a wider range of local used equipment.
The Elinchroms are good, if in my opinion slightly overrated. The Calumets are also very good in my experience, and as you mentioned they have fans.
There are two ways to get a good lighting setup with easily available accessories and support. One is to buy ProFoto. The other is to buy local.
I shoot with Broncolor strobes. They're ungodly expensive, have equally ungodly expensive accessories, and used parts and accessories are hard to come by. That makes it tough when I'm a slightly poor recent college grad. It also makes it more difficult to rent equipment when I need it that's compatible with my current lineup.
I think availability is paramount. Go with Calumet, new or used.