Hi Nick, I think an 8" or at a stretch even a 10" collapsible dob is great for travelling with.
I would recommend the Mead lightBridge as I think it compacts down to the smallest size of the lot. Not as easy as say the skywatcher to take down and reassemble but it's still easy.
http://www.meade.com/manuals/Telesco...ightbridge.pdf
http://www.iceinspace.com.au/41-497-0-0-1-0.html
Cheers
Richard