Ok so what did you do in the end?
I've been testing iPhoto/iMovie/iDVD versus ProShow Gold producing SD and HD files.
So far, the results have been, in order of quality:
ProShow HD
ProShow SD
iPhoto/iMovie HD
iPhoto/iMovie SD
iDVD SD
Using iDVD and bringing the photos in directly from iPhoto was the softest image by far! I'd go so far as to say it was appalling.
The iMovie/iPhoto exports all seem to want to use H264 which is computationally expensive, read damn slow! This also seems a daft choice for SD as well. In fact there is no choice but H264. I've tried custom exports but there doesn't seem to be a standard DVD MPEG2 option.
I want to use iLife because its a breeze to put a slideshow together, but am I missing something with the export process? I just want clean clear and sharp slideshows. I appreciate that an HD version will be sharper, but I should be able to produce a high quality DVD version as well. I feel that it should look just as sharp but be smaller on my laptop screen. But it isn't. Its soft as hell. Its soft out of ProShow as well, not as bad as iDVD but softer than an HD export.
Any tips?