I said the acceleration, top speed and handling are crap if you compare it to a non-truck car with the same engine (I wrote "by comparison" in brackets). =)
Of course it outperforms the Mustang acceleration-wise because it has 200 more bph!
Compare the Dodge to e.g. the Chevrolet Corvette Z06 with 505 bph! 0-100 in 3.7 seconds.
Alternatively you could just compare the RAM SRT-10 to the Viper, which the engine originally comes from...
By the way - if I had lots of money I wouldn't buy tons of similar-ish cars - I would probably own just several, each one for a different occasion. I wouldn't throw away too much money without getting more performance so I'd settle with a "modest" Porsche 997 Turbo or even a Nissan GT-R (to be tuned later :-D) or Audi R8. ^^
Speaking of sports cars - you don't need expensive cars to have fun on a circuit, empty road or abandoned parking lot. I love to do power-slides in my old Seat Cordoba diesel. ;-)
In fact, if you go for the expensive super-cars THINKING you can drive them like Michael Schumacher, you'll most likely end up like this:
Woohoo - a ~1.000.000 Euro wreck. ;-)
P.S. I just checked the charts and your Dodge SRT-10 truck does NOT outperform a standard Mustang GT - at least not in the quad-cab version (4 doors) which you posted - acceleration is exactly the same @ 4.9s for 0-100 (4.8 for the two-door version). All that with 200 bph more - epic fail! Also, since the SRT-10 is a special version of the Dodge Ram it would be only fair to compare it to the Mustang Shelby GT500 (500 bhp - what do you know, good comparison! - 0-100 in 4.6 s) or even the Mustang Shelby GT500KR (540 bhp, 0-100 in 4.1 s), both of which are cheaper and outperform the SRT-10. Ha!