I found it a bit hard to find this too JJJ when I was researching. These sites are effectively the same OTA you're describing for the newts I think:
http://www.skywatchertelescope.net/s...1=1&class2=104
http://www.skywatchertelescope.net/s...1=1&class2=104
That is, about 5Kg for the 6" and 8.75kg for the 8"
Robin is probably right about considering the VC200Ls 2nd hand - I think I've read the larger central obstruction is better suited for CCD nebula work rather than long FL planetary though. I won't say more - you know I'm going to be biased!
