You could also consider these (around £220-£250):
Asus VG23AH 23" 3D IPS
Fujitsu P23T-6P FPR 3D
They both use 60Hz passive 3D IPS panels (most probably e-IPS), so no flickering glasses like in active solution (120Hz), which makes the passive solution a better alternative for the eyes. And as far as I can tell, these are the only 3D IPS monitors on the market atm.
Currently every 120Hz solution has a TN panel, which have limitations in image quality and viewing angles. And bear in mind, active 3D requires twice the frames when compared to passive. This means twice the horsepower needed. Although, one of the good things in the active solution is 120Hz in 2D, whereas passive is limited to 60Hz. The other bad thing about passive is that it theoratically halves the vertical resolution in 3D mode for each eye.
Personally, I despise the active solution. One of the better features that LCD technology brought over CRT was the elimination of flickering. With shutter glasses (active solution), they're bringing the CRT's head-ache-inducing 60Hz flicker artificially back to LCDs. Talk about doing things backwards...
PS. If you're wearing glasses, I would recommend the ASUS, as that's advertized as bundling clip-on glasses, in addition to the regular glasses. Also, OCUK doesn't stock the Fujitsu monitor at all. Here's the link to the ASUS in OCUK:
http://www.overclockers.co.uk/showproduct.php?prodid=MO-037-AS