Thanks Guys,
Mike - good point on the camera, though I'm not sure I've hit the ceiling with the 900nc yet. I've also got an aversion to the filter wheel thingy of monochrome... though I may change my mind when I see the great images from you newly equipped mono guys rolling in.
The 12inch GSO does look tempting and I'd have a Dob for fun
Ving - I considered just leaving at F6.7 it would be great for planetary, but the thing looks like it needs regrinding to remove pits onthe edge that would detract from contrast, so though I would make it more manageabl a size at the same time - more for storage and handling (mount copes with it).
Starkler - I had asked Bird about his ol'd 10in a while back but he wasn't inclined to part with it just yet. Really want a couple more inches to get above the 9.25 sufficiently to warrant.
Keep the suggestions rolling in.
cheers,