Ordered one in 23' a year ago and ViewSonic is perfect for me and £140 sounds a good price with full HD, 16000:1 dynamic contrast ratio and speakers in! Dont forget your quidco as well, it will drop the price to £136ish.
ViewSonics 24" (23.6" viewable) VA2413wm 16:9 widescreen LCD delivers 1920 ?1080 performance and ultra-high 16,000:1 dynamic contrast ratio for unsurpassed HD content on your desktop. Its ideal for business applications where blur-free motion, crisp detail and precise images are critical. The aspect ratio adjustment ensures that even your 4:3 images are displayed without any stretching or distorion. This display is multimedia ready with hidden speakers. The VA2413wm is environmentally friendly with TCO`03 certifi cation and Eco-mode that automatically reduces power consumption and can extend backlight life. The VA2413wm is ideal for corporate use where an eco-friendly, high-performance LCD can enhance your productivity.
See more tech spec in the link by yourself.