Thanks tetsuo!
The P19-2 does get good reviews (here and in other places), the only negative remark I've read somewhere is that its color reproduction isn't very accurate. At the moment I'm slightly leaning towards the HP, which was also positively reviewed here (I'm aware though of the negative experiences some people have reported here on the forum with moving images).
In the meantime the discount on the Dell has expired (but I guess it won't be long before another discount is launched) and I've also found out that de Lacie doesn't have direct input selection, so that one is off the list now.
Decisions, decisions...
Tom