It will be mostly city driving.. im not sure if thats too many miles or not!

go to your local mechanic to do a full inspection, if no major problems then $800 is well worth the money. Infiniti cars are very reliable. sr20de engine in the G20 is one of the strongest 4cyl engine out there, it will last least 200k if u keep up the normal maintenance.
also go to kbb.com to get the idea of what's the car value at 134k mi.

have the car checked out by a mechanic well worth the money