The intelligent part of me says this isn't the best choice for a sedan but the boy racer in me loves the idea of 300+ HP and sports suspension. Please talk me into buying this. 

07 GXP with about 200km on it. It's being sold as is at a small local used car dealer. 

37 minutes ago, ProAc said:

07 GXP with about 200km on it. It's being sold as is at a small local used car dealer. 

Well only you can say if the asking price is reasonable, but 200k is a lot of abuse or love or a blend of the two, so carefully inspect the car, engine, suspension etc. also if you can inspect the passenger side, under the carpet to insure no water leakage has occurred over that 200k, carefully inspect the front subframe. The 04-09 aluminum subframes had cracking issues & the GXPs might have been more common due to hp.

That said how could you not get excited about a GXP!

Go for it, especially if you can have it as a 2nd car.  Last Indian has the best advice for later model Pontiac's.  Take your time N check it out.

Long as it’s in solid shape and you can afford it, why not? 

200k (just around 120,000 miles for the U.S.) is not that bad for an 07.  Thus it should be in fairly good condition.  Do the usual, take it out for a hell of a test run.  See if an oil change shop if they are not busy will let you drive over their pit and the guys can let you go down there or take your cell and take pictures.  Make sure everything works and put in an offer.