Hello, Fanguy.
You're shopping the right way and following up on prospects correctly. At least it's the same way I buy cars. Dickishness doesn't matter.
As for low miles vs. high miles; I've had better luck over the years with higher miles cars that have been driven regularly and well maintained. The few garage queens I've bought have all given me trouble.
It took me 2 months to find a Boxster S in the right condition at the right price here in NorCal where they are pretty common. Just keep looking, and good luck.
Cheers,
Dave