I've been running 2 of these:
http://www.overclockers.co.uk/showproduct.php?prodid=MO-067-IY&groupid=17&catid=510&subcat=
for the past 7-8 months, and I think they're brilliant. Recently had to use the speakers built into one, and frankly they're horrible, but as long as you're using it as just a screen it's great.
I should say, my exposure to other screens is minimal - I used to use Dell 2007FP's (sounds like what you had Corrupt) and now have a DGM L2647 and these Iiyama's. Beyond that, I haven't played with any recent monitors out there, so cannot say if the Iiyama is better or worse than others, I can just say I upgraded to 2 of them and I love them and have had zero issues or cause to complain.
how about this monitor
http://www.overclockers.co.uk/showproduct.php?prodid=MO-046-OK&groupid=17&catid=510&subcat=
the specs are completely identical to this monitor
http://www.overclockers.co.uk/showproduct.php?prodid=MO-071-IY&groupid=17&catid=510&subcat=
but £20 cheaper, the customer reviews also say they got the iiyama monitor.
id say this
http://www.overclockers.co.uk/showproduct.php?prodid=HS-035-AR&groupid=701&catid=57&subcat=1395
which is similar to the OCUK 24"
does it have to be Iiyama and 24"
how about this
http://www.overclockers.co.uk/showproduct.php?prodid=MO-046-DE&groupid=17&catid=1425&subcat=
£30 over
or this
http://www.overclockers.co.uk/showproduct.php?prodid=MO-091-LG&groupid=17&catid=1425&subcat=
great for gaming with 120Hz
If you don't mind one less inch then get the U2311 - 1920 x 1080

on the OCUK website, they state that the DELL U2311H has
That's crazy if no dvi input
I wouldn't suggest going with that BenQ - there are so many horror stories about it.
Hence I would suggest either going for the LG 23in 120Hz monitor with the HDMI input for £162, the lovely Dell U2311H or saving up and getting the Hazro HZ27WC non-glass for £360 (this week).
That said, may I ask what you will mainly be doing with your system?