One of the benefits of PC gaming is that it scales to YOUR budget, not the other way around. Playing games on low/medium is akin to playing on a console, and you can achieve these results with £400 (or whatever the equivalent in yankeebux is). The more you spend, the better the results - but obviously spending less will mean you will have to upgrade more often down the line. £1000 (or equivalent) is enough to max out games nowadays, and this will last you past the upcoming generation of consoles too.