It seems to me both cars are a bit excessive, with 725 horsepower. Neither is able to use the full power due to traction limitation so if you are not going to cut the car up and put in mini-tubs, bigger tires and the suspension mods to go with it, then you are paying for alot of unusable power. I would think that anyone here who is not going to actually race their car would do well to add a supercharger limited to no more than 9 lbs boost with stock internals. I know Kenne Bell is working on a system for the SRT8 which will likely add 150 to 200 hp. Their kits are usually under $7,000.
Buy a 6 speed SRT8, add in another few grand for suspension mods and brake/tire upgrades and you'll have a beast for just over $50,000 that will scare the crap out of most of you. That's my plan....