If I were tempted to spend £169 on a touchscreen monitor I'd be taking my Raspberry Pi down to their Portsmouth showroom and asking if I could try before I buy. The round trip would save the delivery cost as Portsmouth isn't far from Basingstoke.
If you buy it online you've got 7 days to test it and reject it under the distance selling regulations.
The last touchscreen I used with a RPi appeared as a mouse but it needed some simple calibration to work with XWindows.
http://www.lilliputuk.com/monitors/hdmi/fa1012/
Lilliput sent a SDCard with that one although I didn't use that any built my own. The support for eGalax touchscreens is included in the current RPF kernels.