So I decided to get the 4mm TMB planetary II. I know the 5mm would be more useful but it would negate my 6mm since the powers aren't that far apart.
In saying that, I decided to also get a 2x Barlow to convert my 10mm into a 5 if I need to, and my 25mm into a 12.5mm to cater the other gap.
The 30mm super view will have to want for now, but it will be a definite in the future.
Does anyone have a 1.25" GSO 2x barlow to report on what you think of quality? I read good reviews on them, then others that haven't used them say buy cheap get cheap and just buy a televue.
Thanks guys