We were definitely impressed by the Philips Gioco 278G4DHSD. It's a jack-of-all trades. You can use it for video and photo editing, for gaming, for watching (3D) movies and of course for your standard software. It's stronger in some departments than others, but very good in general.
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