[Waxing_Gibbous (Peter)]

I'm sure this has been asked before but...
Light gathering stats aside how much difference will they're be visually between a 10" and 12" inch Bintel dob. I'm interested in nebulae and globs and my current EP lineup is a 20mm TV Plossl, a 13mm Nagler, a 9mm NLV and a 2x Ultima barlow.
So.
I can afford a 10" + something 'naughty' like a 20mm Nagler or a LVW 22, or a 12" with whatever EP's Bintel throws in.
Thoughts?