Consumer Reports on some of the cars mentioned in this thread:
Acura TL:
Class ranking: 85/100
Base MSRP price range: $35,605 - $45,085
Highs: Acceleration, transmission, fuel economy, braking, front-seat comfort, fit and finish, crash-test results.
Lows: Rear seat, trunk opening, steering feel.
Nissan Maxima:
Class ranking: 83/100
Base MSRP price range: $31,400 - $34,100
Highs: Acceleration, transmission, front seat.
Lows: Rear-seat room, overly light steering at low speeds, headlights.
Nissan Altima (V6):
Class ranking: 93/100 (#1 in class)
Base MSRP price range: $20,270 - $30,540
Highs: Controls, acceleration, brakes, quietness.
Lows: Rear-seat head room.
Nissan Altima (V4):
Class ranking: 91/100
Base MSRP price range: $20,270 - $30,540
Highs: Fuel economy, controls, brakes, cabin storage.
Lows: Rear-seat head room.
Infiniti G:
Class ranking: 95/100 (#1 in class)
Base MSRP price range: $32,000 - $58,000
Highs: Acceleration, handling, transmission, braking, front-seat comfort, fit and finish.
Lows: Snug interior, small trunk.
Ford Taurus:
Class ranking: 73/100
Base MSRP price range: $25,420 - $38,020
Highs: Ride, quietness, trunk space, crash-test results.
Lows: Rear visibility, narrow driving position