These are great Frank and the quality loss for such a big increase in render time is very acceptable.
TBH I only ever manage to find errors in the animations "after the fact". You can trim detail, AA, cloud and atmo quality a great deal compared to a normal HQ render but you'll only begin to see artefacts after its been comped together in a full anim. All the anims I've done so far have been 720x576 (or there abouts) and as soon as I started work on a 720p version my workhorse PC kicks the bucket! (a soon to be resolved issue
Is the intention to produce two versions of all your presets, one for "print" work and one for "animation", if so sounds a good plan