75% should do the trick. £150 is a bit short is you want something made of metal. £200-£250 would be easier. But really, if you can afford it this is somethin

75% should do the trick. £150 is a bit short is you want something made of metal. £200-£250 would be easier. But really, if you can afford it this is something that is likely to outlast your computer by a long shot and be use for hours every day. There are diminishing returns at some point, but you're going to reach that point before ~ £500.