The Lenser gets great feedback on this forum, and its worth checking out Maplin, since they sometimes do strangely priced packages on Lensers. Fenix is the other brand of course, and again the LD series gets fantastic reviews. The Photon shop has the LD20 in a R4 for £45 (2xAA).
Since I can't quite justify the above brands to my wife (yet), I'm using DX torches.
DX is kind of addictive, since it all looks pretty cheap, and then you find you've spent the same amount as you would have done on a Fenix or Lenser, but you've now got 4 torches which might not last very long. However, I've had no problems at all with the Romisens you find on there (The Shining Beam website was selling them modded, so it seemed worth taking a risk).
The little R2-G2
http://www.dealextreme.com/p/romisen-mxdl-rc-g2-cree-flashlight-black-1xaa-3607 is a steal at $12 . Its not the brightest, but very good workmanship, and is pretty small. Ideal for just putting in your pocket for a backup, and has a huge fan club on the torch sites. The RC-N3 is pretty good (although DX does not sell the more powerful version), and I'm impressed with the RC-A4, which is a Q3 using a C123 battery. It even survived being put through the washing machine (although now runs a little hotter). On the other hand, thats about $40 I've spent, which might just might have got me a P7....
The Alpkit Gamma is a bargain - for £12.50 its fantastic value for money, even if your just going to do some work in the loft.