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Rob, In my limited knowledge of astrophotography, my opinion doesn't mean much, but from my fairly extensive knowledge of dslr's I'll say more time/exposures at lower ISO's is usually always going to yeild better results.
However, some targets in the sky are very faint, and may not show up at the lower ISO speeds.. I dont know that for sure, but I would assume that as your shot without the ISO800 image included shows alot less nebulosity..
Also, in photoshop, have you tried setting your black point? the black background in that image doesnt seem very black to me..
Do you mind me having a quick play with one of the images?
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