Just had a look at http://www.Jessops.com
(not the cheapest shop but good guide becuase they do tend to list just about everything!)
Sunpak PZ40x in KonMin AF is £150
KonMin 3600HS(D) is £170
KonMin 5600HS(D) is £290
Results look good enough in your test image. Do you think its worth the loss of 2nd sync (shame) and no wireless (shame) ....
Does is tilt & swivel. The 3600HS only tilts no swivel. Personally i think the swivel is important.
Perhaps handy as a small travel flash, you said it was compact (only 2x AAs)
Another page on the PZ40xhttp://www.intro2020.co.uk/pages/sunpak5.htm