Great price for a 4670. Cheapest elsewhere is about £64.
Gets consistently great reviews and is Tom's Hardware's choice for the best budget graphics card (although it is perhaps more of a mid-range card):http://www.tomshardware.com/reviews/best-graphics-card,2118-2.html
Although not one of the big name brands, this Palit card also gets some great reviews:http://www.tweaktown.com/reviews/1692/17/palit_radeon_hd_4670_super_512mb_graphics_card/index.htmlhttp://www.hitechlegion.com/reviews/video-cards/63-palit4670?start=9
This card is known for its very low power usage and doesn't require any external power connections. For most systems a 350W supply would be plenty.
It also has a great selection of ports - VGA, DVI, HDMI and DisplayPort. The only downside for some might be that it is a double width card.
Mine came today - delivered in 2 working days with the free delivery option.
Some of the reviewers have noticed that the card actually registers as having 1GB memory although i suspect mine has 512MB. Will confirm once it's installed tonight. Edit: My card shows up as 1024MB in Catalyst Control Centre too, but I need to do some more digging before I actually believe it has 1GB. Edit: GPU-Z reports 512MB, which is what I believe it is.
...plus a potential 3% quidco!
Edit 23/02/09: Price reduced from £57.49 to £55.19!