What components should I get?

[Gyldenglad]

The PC I recommended will last 3 years at least. That is unless something epic happens which we can't foresee.
You can't really build a PC to last more than 3 years, because if you do so it will cost like £ 3000. Imo £ 800 for a PC that last 3 years is a good purchase, if you are serious about PC then you should be aware that 3 years is probably what you get.

Uhm.. That is 3 years if games continue to increase in performance required as they tend to do. If you just keep it cool and clean the components and do proper maintenance and not OC it then I don't see why it wouldn't hold for 5 years