Buks
I have not tried the PD MK III but know the Mk II pretty well. Picture quality was quite respectable but rainbows were more noticeable than the Sim2s. The casework got pretty hot (250w lamp in a very compact case). It did not have the powered zoom and focus or the optical lens shift capabilty and the lamp life was about half of that of the Sim2s.
I think you will be pleasantly surprised at the quality of the latest generation of Sim2 projectors. They have moved on in leaps and bounds since the original 200/300 series.
The Domino 30H in particular represents excellent value for money at £4500.
Hope this helps
Jeff