Looks right to me. The Holt has always been less expensive than the Harken. The cleat for the Holt appears to stick out more and looks like it could get caught on things. Harken seems to be the kicker of choice in the states.
The Harken is in Laser's GXD setup. It's supposed to be better design partly because the secondary line has a bit less friction. You can see the difference here: http://www.apsltd.com/Tree/d90000/e87451.asp
However either is going to be alot better than your old kicker.