Cadillac XLR:
<img src="http://auto.consumerguide.com/images/auto/editorial/xlr.jpg">
The XLR will be fitted with a high performance version of Cadillac's 4.6 liter Northstar V-8, with 32 valves, dual overhead cams and screaming redline power of 315 hp.
Pack that much power into a car that'll likely weigh only a few hundred pounds more than a Corvette (probably around 3800 pounds total) and the XLR should be capable of 0-60 mph in the mid-five-second range (quicker than a Lexus SC430 or Mercedes SL500) and be capable of a top speed close to 170 mph, sans any speed-limiting chip in the computer, however.