i run a 8" f6 reflector on my heq5 and its right on the border of needing extra weights.... but its great visually
and the mount handles it with ease.
of the ones you have pointd out tho i'd go a the c8 especailly since its shorter then a 8" newt and therefore probably easier for the mount to swing around. the c8 is also lighter by a bit (not sure of weights) and with a longer fl it would be easier to use on planets. the newt would be better for wideer fields as you wouldnt need a focal reducer... anyhow my answer is it betweenteh 2 8 inchers cause you want to do visual too...
if it were just pics i might have said ed100... might...
and if you buy the 8" sct and decide you dont want it i'll swap my 8" f6 newt for it
