With prices of £158 and £166 respectively, the Corsair AX760i and AX860i are more expensive than the power supplies from our recent round-up, but you do get high-quality PSUs for that price. Their efficiency is outstanding, they're extremely quiet and the voltages are super-stable.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips