Buying my first boxster advice wanted please

[kipper12]

im sure this gets asked a lot, so apologies for repetition

I have a budget of 20 to 25 k, at a push. Looking on line, I notice boxsters all into slightly older low mileage or newer with higher mileage. I'm after a 2.9/3.4 not earlier variants. Should I go older with fewer miles or vice versa?

I'm also interested in opinions on manual vs PDK, and any general wisdom

Cheers