If you go with the Viper engine, watch the break-in procedure... I guess it's crucial to set the rings properly. I copied this from the viperclub.org website:
Break in depends on your comfort level, but I believe the manual recommends keeping the revs below around 2,000 for the first 1,000 or so miles. Wait till you've got full-scale reading on the
oil pressure gauge before you start moving. It's a good idea to change the
oil after the first 1000 miles after taking delivery. For the
oil change interval it's recommend to do so every 3,000 if you do a lot of stop and go driving.
One big ‘gotcha’ not seen in the manual is when these cars are breaking in they dislike idling in traffic. The car heats up considerably and you can feel the exhaust temperature through the side of the car. You may want to stay away from situations where you might be sitting at idle or in traffic during the first 2,000 or so miles.
Dan