I know that this might be a bit late as I haven't been on much. I have a Oztrail Cabin dome 10 that I don't use much anymore due to the CT. But in setting up I alway put the tarp up first then erected the tent under it. It made it alot easier to manage and no need to be dragging a heavy tarp over the tent.
My Ozrtrail is nylon and waterproofed to 3000cpu's, that is to say you can dump a volume of 3ltrs on it in one go before it starts to leak. There is off course the Oztrail RV's or Tourers and the Blackwolf's that are of ripstop canvas/nylon blend and come with a fly or as an optional extra. Very good quality, very weatherproof and extremely quick set up. Not cheap, but worth the money according to those I know that have them.
Your Tourers start from around $500 with the others from around the $1100...
Life can throw nothing at you that beer won't fix