Which is better the Corsair H50 or the Coollt ECO ALC, both about the same price £58 dont really want to spend any more than this.
Save some money and get http://www.bit-tech.net/hardware/cooling/2010/07/14/thermaltake-frio-cpu-cooler-review/1
I'd say go for the H70 if you want to go this route. Having used the coolit and the H50 I would say go with the H50, they are pretty much the same on standard speeds but the H50 does much better when overclocked, especially when set up in push/pull config.
Do you move your system often? If yes, go for the Corsair H50/H70 as this places 90% of the weight of the cooler on the case, so no paranoia of killed motherboards. If no, go for the TT Frio, as it's a very good cooler at a very good price. Either way, stay away from CoolIT products. If you google it, many of them get broken barbs and leak...