What would you do?

frost

The 370 is a great car to purchase if you have a different car. In my humble opinion, the changes from the 350 to the 370 are not vast enough to warrant trading in a 350. I mean, of course it sounds awesome in theory, but that's going to cost you several thousand dollars and put you even further away from finally paying your auto off.
As far as the bike, I don't want to sound like an old man (especially since I'm 28), but San Anton is no place for motorcycles. I don't know what your experience is riding a bike in the city, but it's not enjoyable when you can't ride anywhere without near misses and heart attacks.
So in summary, the 350 is an awesome car, spend a little money to trick it out a little so you can be happy with it a while longer.

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370z OG