The Dodge/Chrysler 3.5L engines are VERY reliable. I own a 300m with a 3.5L with bolt-ons that I have had for 7 years now with no engine problems what-so-ever. This is the same engine that is being used in the LX platform. The general concensus on the 300m and intrepid boards is the 3.5L is virtually bullet-proof. There is one member that recently turned 400,000 miles on his 2001 300m.
http://www.dodgeintrepid.net/forums/showthread.php?t=102505
You are right about the Dodge/Chrysler Engines being very reliable. I have a friend of mine who owns a 1995 Chrysler Concorde with the 3.5 Liter engine which he bought when it was 5 years old. He's already put over 120,000 miles on the car and it's been trouble free. He still has the original engine and transmission in it.
In the past 3 weeks, I've been doing a lot of research and talking to a lot of people about the Dodge Charger vehicles. The Dodge Charger has excellent reviews and it is a very reliable and comfortable full size car with a lot of power. For the most part, the Charger is a trouble free vehicle. I also like the design and the styling a lot. And the interior looks really nice.
So, I ended up buying and ordering a brand new 2008 Dodge Charger R/T with 5.7 Liter V8 Hemi with the Road & Track Performance Package. I ended up paying $100 over the dealer invoice price for the car minus whatever rebate will exist at the time of delivery. Overall, I love the Charger. The car is fully loaded and it comes with Performance Seats, Performance Steering, Performance Exhaust, Performance Suspension, 20" inch Chrome Clad Wheels and tires, Front and Rear Spoiler, and the interior is loaded. My Charger will have an extra 10hp than the regular R/T because of the Road & Track Performance Package that I ordered with it. It will have 350hp and 390 ft/lbs of torque which is plenty of power and torque for a 4.000 lb full sized American muscle car.
The only things that I didn't want to get it with is the Navigation System and the Sunroof. Other than that, the vehicle is fully loaded.
At this point in time, I don't care very much about whether or not my Charger R/T is going to beat a Mustang GT in a race. I am more concerned about safety and about having more interior space. I also need to have a full size car and the Charger R/T is very roomy.