The Lexus GS300 qualifies as a midsize sedan. This is a great car, and it has only improved with each new generation Lexus has released. Its latest design was in 2006; however, the 2006 model was discontinued after a year and then rereleased as the GS350. Lexus made the GS350 in a response to the consumer complaints about the lack of power in the GS300. The GS350 was released with a 3.5 Liter V6 engine. Both the GS300 and the GS350 are identical except for the beefed up engine. Hope this helps.
The 2007 Lexus IS-350 has a V6 engine.
The 2007 Lexus IS-250 has a V6 engine.
The 2007 Lexus IS-350 has a 3.5 L base engine size.
The 2007 Lexus IS-250 has a 2.5 L base engine size.
The 2007 Lexus LS-460 has a V8 engine.
The 2007 Lexus GS-450H has a V6 engine.
The 2007 Lexus ES-350 has a V6 engine.
The 2007 Lexus RX-350 has a V6 engine.
The 2007 Lexus GS-450H has a 3.5 L base engine size.
The 2007 Lexus GS-350 has a 3.5 L base engine size.
The 2007 Lexus ES-350 has a 3.5 L base engine size.