RedUK, your setup seems fine to me! I mean, I have a Maxtor hard drive (the Diamondmax 10 250Gb 16Mb Cache version), and it's great! I mean, even if it does fail, who doesn't back up work nowadays? The PSU is great! Honestly, mine has been working fine, no problems with that!
Also, I have no idea why people have something against XFX (probably because they are not as popular in the US than over here in the UK), but so far they have produced THE fastest 7800GTX (490/1300), so I don't see why the complaints are coming in about them :S Loads of my friends have XFX versions of nVidia cards, and nothing has gone wrong with them, so your setup looks really good
The only thing I would change is the Kingston RAM, go for something like OCZ or Corsair, or like truebe said, if you want to be crazy, go for the G Skill
Hope that helps!