Whoa,
I never thought that you think me stupid, or even the particular question
You have made it clear that the budget is not worth it, plus I had never really considered the question of where balanced started.
So if at all I would think about something dual mono or thereabouts.
The K340 right now is my main phone, I have a few AKG 2xx coming in, some of them 600 Ohms, oh and a K1000 that is just passing through...
So indeed at the moment I am more thinking about using a standard speaker amp to drive the cans with divided ground and see how that goes.
Does that make sense??