The new '99+ GT's make 270 horsepower (not sure about torque), run high 13's/low 14's in a 5 speed GT coupe. A guy where i work has a '01 5 spd convertible that ran 14.2 on his second time to the track, so they go pretty good stock.
The weak point in those vehicles is the T45 transmission which has a few recurring problems (but can also go for years without any problems even with abuse) and also Ford has somewhat addressed chassis stiffness, but it's still a flexy platform.
The first thing i would do if i bought a new mustang would be to get some 3.73 gears, aftermarket shifter (overshifting will break/bend the shift forks, plus stock shifter sucks), and maybe a fenderwell cold air system.
The new mustangs though are pretty well built and very fun to drive.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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