Turbo vs Normal?

I have another question for you guys, I have also considered Turbos, would love the p337. but that falls outside my budget. I read somewhere that the turbos on earlier models have automatic wastegates, how do they compare with the newer ones? and with the normally aspirated? is there too much more maintenance? if they are automatic, what manifold pressure do they keep?

I am mostly considering them to have the capability of going over the weather ocasionally, but must of my flying will be below oxigen altitudes anyway.

Regards,

Ignacio