Hi Juno,
Have a range of dobs from 8inch to 16inch. In terms of view and portability - i think the 10 inch is ideally placed. I have found 12inch and above I need a trolley to move the scopes as they get from my perspective, bulkier and heavier to move.
The views in the 10inch are nice and bright when compared to the 8 inch. The view from the 10inch to 12 inch was only marginally brighter for me.
Planets i found looked better in the 10inch as the image is bright and i can see more detail for myself.
It sounds like you are already leaning towards the 10inch as others have picked up as well. I would recommend to follow your heart as you will always wonder if you got the 8inch and wonder what would the 10inch view would be.
Hope this helps.
Ps. I recommend budgeting for a collimation tool if you dont have one for the dob. I have a couple of laser ones i use.
Mel