Thanks for all the input guys!
From alll this I've decide to get the 12". At least down the track I won't need to upgrade again, and I won't be left wondering "If only I had got the 12", what would the views be like?) :+)
My previous scope was a 6", so going from 6 to 12 should be a real shock for me. I've only just started this hobby and already I'm hooked!
All that is left for me to do is to make sure that it will fit into my car 100%.
My back seat folds down completely parralel, giving me 1.7m of length.
I'm just not sure I will be able to angle it through the boot. Being 36cm in Diameter. To make sure, I have made up a quick "mock" scope, from 2 plywood circles and two posts, cut at the specs of the GS 12", and will try to shove it onto my car. I made it at work today and have yet to try it. It sure did keep the guys guessing at work today guessing as 2 what I was making!!