The market is definitely cool at the moment - though there's signs of life this month.
Maybe the pressure on interest rates is thought to be easing?
(It's not just affecting Aeros :-/ )
I'd think that the car's history is as important as anything - and with Aeros there's a chance the car will be known here, and perhaps the owner too.
As for servicing - who do you trust?
Even though it's a significant hike, I take mine back to Williams, so that the same person is looking at the car year after year. Each Aero is likely a unique spec. I suspect they all have their individual foibles too, so maybe it's best to remove the additional variable of a different mechanic looking after the car?
Will