I've been searching for a cheap PC monitor and today in my Tesco extra I found a 23" Acer X233H for £109 which I bought.
It has 1920x1080 (HD) resolution and a 5ms refresh. They do make a version with a DVi connector but this one only has a D-sub (analog) connection. That said, it is a crisp and clear display with plug-and-play (just remember to change your display settings to 1920x1080, or it will look fuzzy - as most LCD monitors do if not running at their designed resolution).
You can see the specs on the US Acer site http://us.acer.com,
click products then LCD monitors.
There were 4 units in the Yeading branch of Tescos today - on the end of an aisle half way between the front door and the Computing section at the back!