mercedes c300 sport sedan, lexus is250, infiniti g35 sedan, or bmw 3 series sedan 328i

the g35. better looking, performance, and power. the only car that comes close to its reliability is the lexus is250.

Go with IS250 because the resale value is better than the rest that u listed. Performance is also as if its a real sports car the g35 does have more power but weights in a 1000lbs heavier. Where as a friend of mines IS250 runs mid 13 is on a quarter mile stock & l guarantee u that the G35 would never be able to do that stock. But its just my 2 cents here r some specs.

Infinti G35
http://automotive.com/2008/12/infiniti/g35/specifications/index.html

Lexus IS250
http://automotive.com/2008/12/lexus/is250/specifications/index.html

If u r going for a 3.5 litre engine, why not check out the Lexus GS450h. It consumes gas like a 3.5 litre but puts out the power of a 4.5 litre as it is a hybrid. Haggle with the dealer & u can probably get one for the same price as a g35 as most people do not think about Lexus & hybrid ( l got mine for dealer invoice). As someone said, they r the only cars where u will get proven reliability. Plus, the GS450h has almost instant torque from the big electric motors (Think Prius on serious steroids) & it is a hoot to drive.

l have driven all of these.
Some more than a few times.

The Lexus has the smoothest and quietest ride.
The Infiniti is most fun to drive and most reliable.

l would choose one of them.
The BMW and Mercedes are less reliable and more expensive to maintain.

Lexus GS350 is more related to the other cars in your list, not the IS250.

The Lexus or Infiniti because they are the most reliable and the Lexus will have a great resale value. The c300 are nice but l do not think they're that reliable.

In my opinion, you're better off buying a Lexus IS250.

Lexus,you will be glad you did.