I'm setting up a place to do proper macro photography, so I'll update my pictures with scale references once I have that done. I'd say they're about the same size as an Imperial cruiser, though the Basestars take up more space since they're spindly.
That company makes fighters, as do several others. Are you looking specifically for BSG?
I have some issues with BFG, but it's a fun game regardless. I played Eldar for a very long time. I've been considering getting some Rense for Firestorm Armada, but I have to justify it. I own so many games already, and I'm partial to grabbing some star destroyers next. Depends on how things progress.
I've heard good things about Jovian Chronicles (which is what I think you're talking about, since I don't remember them making models for HG ships). I prefer DP9's older games, probably since I used to play them. Blitz just didn't feel right to me.