Dragon has made some pretty models for the SC1 ships, and about half of the SC2 ships as well, although I still haven't managed to get the SC2 models up.
I've now rendered then out as well, if you head over to this
thread at the SCDB you can find the full details there.
Or you can just grab the file
here. Renders are 512x512 and each ship has 72 frames of rotation. eg:
In regards to the HD work, i'm not quite sure if these look better than the models already created for Timewarp.
Quite often mine don't look better (see Mycon Podship in particular) however the problem with the Timewarp images (or maybe it would be better say the decision taken at the time) is that they're really, really small. About 50 pixels across vs 500 so on modern screens running HD they can't be zoomed in for close combat without looking pixellated.
I've answered Angelfishes comment here and at the SCDB because there've been a couple of comments about using Timewarps sprites in the HD project and my opinion is that I don't think they'll work unless they're re-rendered at larger resolutions.